diff --git a/changelog.md b/changelog.md
index 62755f7..febd96a 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## 2025-12-09 - 3.3.0 - feat(dees-appui-base)
+Add unified App UI API to dees-appui-base with ViewRegistry, AppRouter and StateManager
+
+- Introduce ViewRegistry for declarative view registration and rendering (supports tag names, element classes and template functions).
+- Add AppRouter with hash/history/external/none modes, URL synchronization, navigate/back/forward and onRouteChange listener support.
+- Add StateManager to persist UI state (localStorage, sessionStorage or in-memory) with save/load/update/clear APIs.
+- Extend interfaces (interfaces/appconfig.ts) with IAppConfig, IViewDefinition, IRoutingConfig, IStatePersistenceConfig and IAppUIState.
+- Expose new public DeesAppuiBase methods: configure, navigateToView, getCurrentView, getUIState, restoreUIState, saveState, loadState, getViewRegistry, getRouter.
+- Maintain backward compatibility with existing property-based API and slot usage.
+- Export new modules (view.registry, app.router, state.manager) from dees-appui-base index and update element exports.
+
 ## 2025-12-08 - 3.2.0 - feat(dees-simple-appdash,dees-simple-login,dees-terminal)
 Revamp UI: dashboard & login styling, standardize icons to Lucide, and add terminal background/config
 
diff --git a/readme.hints.md b/readme.hints.md
index 01ce966..97520cd 100644
--- a/readme.hints.md
+++ b/readme.hints.md
@@ -680,4 +680,124 @@ According to Lit's documentation (https://lit.dev/docs/components/decorators/#de
 - All unit tests passing
 - Manual testing of key components verified
 - No regressions detected
-- Focus management and interactions working correctly
\ No newline at end of file
+- Focus management and interactions working correctly
+
+## Enhanced AppUI API (2025-12-08)
+
+The `dees-appui-base` component has been enhanced with a unified configuration API for building real-world applications.
+
+### New Modules:
+
+1. **ViewRegistry** (`view.registry.ts`)
+   - Manages view definitions and their lifecycle
+   - Supports tag names, element classes, and template functions as view content
+   - Methods: register, get, renderView, findByRoute
+
+2. **AppRouter** (`app.router.ts`)
+   - Built-in routing with hash or history mode
+   - External router support for framework integration
+   - Methods: navigate, back, forward, onRouteChange
+
+3. **StateManager** (`state.manager.ts`)
+   - Persists UI state (collapsed menus, selections, current view)
+   - Supports localStorage, sessionStorage, or memory storage
+   - Methods: save, load, update, clear
+
+### New Interfaces (in `interfaces/appconfig.ts`):
+
+```typescript
+interface IAppConfig {
+  branding?: { logoIcon?: string; logoText?: string };
+  appBar?: IAppBarConfig;
+  views: IViewDefinition[];
+  mainMenu?: IMainMenuConfig;
+  routing?: IRoutingConfig;
+  statePersistence?: IStatePersistenceConfig;
+  onViewChange?: (viewId: string, view: IViewDefinition) => void;
+}
+
+interface IViewDefinition {
+  id: string;
+  name: string;
+  iconName?: string;
+  content: string | (new () => HTMLElement) | (() => TemplateResult);
+  secondaryMenu?: ISecondaryMenuGroup[];
+  contentTabs?: ITab[];
+  route?: string;
+}
+
+interface IRoutingConfig {
+  mode: 'hash' | 'history' | 'external' | 'none';
+  basePath?: string;
+  defaultView?: string;
+  syncUrl?: boolean;
+}
+```
+
+### New Public Methods on DeesAppuiBase:
+
+```typescript
+// Configure with unified config
+configure(config: IAppConfig): void
+
+// Navigation
+navigateToView(viewId: string): boolean
+getCurrentView(): IViewDefinition | undefined
+
+// State management
+getUIState(): IAppUIState
+restoreUIState(state: IAppUIState): void
+saveState(): void
+loadState(): boolean
+
+// Access internals
+getViewRegistry(): ViewRegistry
+getRouter(): AppRouter | null
+```
+
+### Usage Example (New Unified Config API):
+
+```typescript
+import type { IAppConfig } from '@design.estate/dees-catalog';
+
+const config: IAppConfig = {
+  branding: { logoIcon: 'lucide:box', logoText: 'My App' },
+  views: [
+    { id: 'dashboard', name: 'Dashboard', iconName: 'lucide:home', content: 'my-dashboard' },
+    { id: 'settings', name: 'Settings', iconName: 'lucide:settings', content: 'my-settings' },
+  ],
+  mainMenu: {
+    sections: [{ views: ['dashboard'] }],
+    bottomItems: ['settings'],
+  },
+  routing: { mode: 'hash', defaultView: 'dashboard' },
+  statePersistence: { enabled: true, storage: 'localStorage' },
+};
+
+html`<dees-appui-base .config=${config}></dees-appui-base>`;
+```
+
+### Backward Compatibility:
+
+The existing property-based API still works:
+
+```typescript
+html`
+  <dees-appui-base
+    .mainmenuGroups=${groups}
+    .secondarymenuGroups=${secondaryGroups}
+    @mainmenu-tab-select=${handler}
+  >
+    <div slot="maincontent">...</div>
+  </dees-appui-base>
+`;
+```
+
+### Key Features:
+
+- **Declarative View Registry**: Map menu items to view components
+- **Built-in Routing**: Hash or history mode with URL synchronization
+- **External Router Support**: Integrate with Angular Router or other frameworks
+- **State Persistence**: Save/restore collapsed menus, selections, and current view
+- **View-specific Menus**: Each view can define its own secondary menu and tabs
+- **Full Backward Compatibility**: Existing code continues to work
\ No newline at end of file
diff --git a/ts_web/00_commitinfo_data.ts b/ts_web/00_commitinfo_data.ts
index 6a4db6b..82ee55e 100644
--- a/ts_web/00_commitinfo_data.ts
+++ b/ts_web/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@design.estate/dees-catalog',
-  version: '3.2.0',
+  version: '3.3.0',
   description: 'A comprehensive library that provides dynamic web components for building sophisticated and modern web applications using JavaScript and TypeScript.'
 }
diff --git a/ts_web/elements/00group-appui/dees-appui-base/app.router.ts b/ts_web/elements/00group-appui/dees-appui-base/app.router.ts
new file mode 100644
index 0000000..35137dc
--- /dev/null
+++ b/ts_web/elements/00group-appui/dees-appui-base/app.router.ts
@@ -0,0 +1,271 @@
+import type { IRoutingConfig, IViewDefinition } from '../../interfaces/appconfig.js';
+import type { ViewRegistry } from './view.registry.js';
+
+export type TRouteChangeCallback = (viewId: string, params?: Record<string, string>) => void;
+
+/**
+ * Router for managing view navigation and URL synchronization
+ */
+export class AppRouter {
+  private config: Required<Omit<IRoutingConfig, 'notFound'>> & Pick<IRoutingConfig, 'notFound'>;
+  private viewRegistry: ViewRegistry;
+  private listeners: Set<TRouteChangeCallback> = new Set();
+  private currentViewId: string | null = null;
+  private isInitialized: boolean = false;
+
+  constructor(config: IRoutingConfig, viewRegistry: ViewRegistry) {
+    this.config = {
+      mode: config.mode,
+      basePath: config.basePath || '',
+      defaultView: config.defaultView || '',
+      syncUrl: config.syncUrl ?? true,
+      notFound: config.notFound,
+    };
+    this.viewRegistry = viewRegistry;
+  }
+
+  /**
+   * Initialize the router
+   */
+  public init(): void {
+    if (this.isInitialized) return;
+
+    if (this.config.mode === 'hash') {
+      window.addEventListener('hashchange', this.handleHashChange);
+      // Check initial hash
+      const initialView = this.getViewFromHash();
+      if (initialView) {
+        this.navigate(initialView, { source: 'initial' });
+      } else if (this.config.defaultView) {
+        this.navigate(this.config.defaultView, { source: 'initial' });
+      }
+    } else if (this.config.mode === 'history') {
+      window.addEventListener('popstate', this.handlePopState);
+      // Check initial path
+      const initialView = this.getViewFromPath();
+      if (initialView) {
+        this.navigate(initialView, { source: 'initial' });
+      } else if (this.config.defaultView) {
+        this.navigate(this.config.defaultView, { source: 'initial' });
+      }
+    } else if (this.config.mode === 'none' && this.config.defaultView) {
+      this.navigate(this.config.defaultView, { source: 'initial' });
+    }
+    // For 'external' mode, we don't set up listeners - the external router handles it
+
+    this.isInitialized = true;
+  }
+
+  /**
+   * Navigate to a view by ID
+   */
+  public navigate(
+    viewId: string,
+    options: {
+      source?: 'navigation' | 'popstate' | 'initial' | 'programmatic';
+      replace?: boolean;
+      params?: Record<string, string>;
+    } = {}
+  ): boolean {
+    const { source = 'programmatic', replace = false, params } = options;
+
+    const view = this.viewRegistry.get(viewId);
+    if (!view) {
+      console.warn(`Cannot navigate to unknown view: ${viewId}`);
+      if (this.config.notFound) {
+        if (typeof this.config.notFound === 'function') {
+          this.config.notFound();
+        } else {
+          return this.navigate(this.config.notFound, { source, replace: true });
+        }
+      }
+      return false;
+    }
+
+    const previousViewId = this.currentViewId;
+    this.currentViewId = viewId;
+
+    // Update URL if configured
+    if (this.config.syncUrl && this.config.mode !== 'none' && this.config.mode !== 'external') {
+      this.updateUrl(view, replace);
+    }
+
+    // Notify listeners
+    this.notifyListeners(viewId, params);
+
+    return true;
+  }
+
+  /**
+   * Navigate back in history
+   */
+  public back(): void {
+    if (this.config.mode === 'hash' || this.config.mode === 'history') {
+      window.history.back();
+    }
+  }
+
+  /**
+   * Navigate forward in history
+   */
+  public forward(): void {
+    if (this.config.mode === 'hash' || this.config.mode === 'history') {
+      window.history.forward();
+    }
+  }
+
+  /**
+   * Get current view ID
+   */
+  public getCurrentViewId(): string | null {
+    return this.currentViewId;
+  }
+
+  /**
+   * Add a route change listener
+   */
+  public onRouteChange(callback: TRouteChangeCallback): () => void {
+    this.listeners.add(callback);
+    return () => this.listeners.delete(callback);
+  }
+
+  /**
+   * Handle external navigation (for external router mode)
+   */
+  public handleExternalNavigation(viewId: string, params?: Record<string, string>): void {
+    if (this.config.mode !== 'external') {
+      console.warn('handleExternalNavigation should only be used in external mode');
+    }
+
+    const previousViewId = this.currentViewId;
+    this.currentViewId = viewId;
+    this.notifyListeners(viewId, params);
+  }
+
+  /**
+   * Sync state with URL (for external router integration)
+   */
+  public syncWithUrl(): string | null {
+    if (this.config.mode === 'hash') {
+      return this.getViewFromHash();
+    } else if (this.config.mode === 'history') {
+      return this.getViewFromPath();
+    }
+    return null;
+  }
+
+  /**
+   * Get the current route from the URL
+   */
+  public getCurrentRoute(): string {
+    if (this.config.mode === 'hash') {
+      return window.location.hash.slice(1) || '';
+    } else if (this.config.mode === 'history') {
+      let path = window.location.pathname;
+      if (this.config.basePath && path.startsWith(this.config.basePath)) {
+        path = path.slice(this.config.basePath.length);
+      }
+      return path.replace(/^\//, '');
+    }
+    return '';
+  }
+
+  /**
+   * Build a URL for a view
+   */
+  public buildUrl(viewId: string): string {
+    const view = this.viewRegistry.get(viewId);
+    const route = view?.route || viewId;
+
+    if (this.config.mode === 'hash') {
+      return `#${route}`;
+    } else if (this.config.mode === 'history') {
+      return `${this.config.basePath}/${route}`;
+    }
+    return '';
+  }
+
+  /**
+   * Destroy the router
+   */
+  public destroy(): void {
+    if (this.config.mode === 'hash') {
+      window.removeEventListener('hashchange', this.handleHashChange);
+    } else if (this.config.mode === 'history') {
+      window.removeEventListener('popstate', this.handlePopState);
+    }
+    this.listeners.clear();
+    this.isInitialized = false;
+  }
+
+  // Private methods
+
+  private handleHashChange = (): void => {
+    const viewId = this.getViewFromHash();
+    if (viewId && viewId !== this.currentViewId) {
+      this.navigate(viewId, { source: 'popstate' });
+    }
+  };
+
+  private handlePopState = (): void => {
+    const viewId = this.getViewFromPath();
+    if (viewId && viewId !== this.currentViewId) {
+      this.navigate(viewId, { source: 'popstate' });
+    }
+  };
+
+  private getViewFromHash(): string | null {
+    const hash = window.location.hash.slice(1); // Remove #
+    if (!hash) return null;
+
+    // Try to find view by route
+    const view = this.viewRegistry.findByRoute(hash);
+    return view?.id || null;
+  }
+
+  private getViewFromPath(): string | null {
+    let path = window.location.pathname;
+
+    // Remove base path if configured
+    if (this.config.basePath) {
+      if (path.startsWith(this.config.basePath)) {
+        path = path.slice(this.config.basePath.length);
+      }
+    }
+
+    // Remove leading slash
+    path = path.replace(/^\//, '');
+
+    if (!path) return null;
+
+    const view = this.viewRegistry.findByRoute(path);
+    return view?.id || null;
+  }
+
+  private updateUrl(view: IViewDefinition, replace: boolean): void {
+    const route = view.route || view.id;
+
+    if (this.config.mode === 'hash') {
+      const newHash = `#${route}`;
+      if (replace) {
+        window.history.replaceState(null, '', newHash);
+      } else {
+        window.history.pushState(null, '', newHash);
+      }
+    } else if (this.config.mode === 'history') {
+      const basePath = this.config.basePath || '';
+      const newPath = `${basePath}/${route}`;
+      if (replace) {
+        window.history.replaceState({ viewId: view.id }, '', newPath);
+      } else {
+        window.history.pushState({ viewId: view.id }, '', newPath);
+      }
+    }
+  }
+
+  private notifyListeners(viewId: string, params?: Record<string, string>): void {
+    for (const listener of this.listeners) {
+      listener(viewId, params);
+    }
+  }
+}
diff --git a/ts_web/elements/00group-appui/dees-appui-base/dees-appui-base.ts b/ts_web/elements/00group-appui/dees-appui-base/dees-appui-base.ts
index a2a4d33..2076510 100644
--- a/ts_web/elements/00group-appui/dees-appui-base/dees-appui-base.ts
+++ b/ts_web/elements/00group-appui/dees-appui-base/dees-appui-base.ts
@@ -17,6 +17,11 @@ import type { DeesAppuiMaincontent } from '../dees-appui-maincontent/dees-appui-
 import type { DeesAppuiActivitylog } from '../dees-appui-activitylog/dees-appui-activitylog.js';
 import { demoFunc } from './dees-appui-base.demo.js';
 
+// New module imports
+import { ViewRegistry } from './view.registry.js';
+import { AppRouter } from './app.router.js';
+import { StateManager } from './state.manager.js';
+
 // Import child components
 import '../dees-appui-appbar/index.js';
 import '../dees-appui-mainmenu/dees-appui-mainmenu.js';
@@ -116,6 +121,19 @@ export class DeesAppuiBase extends DeesElement {
   @state()
   accessor activitylog: DeesAppuiActivitylog | undefined = undefined;
 
+  // NEW: Unified config property
+  @property({ type: Object })
+  accessor config: interfaces.IAppConfig | undefined = undefined;
+
+  // NEW: Current view state
+  @state()
+  accessor currentView: interfaces.IViewDefinition | undefined = undefined;
+
+  // NEW: Internal services (not reactive, managed internally)
+  private viewRegistry: ViewRegistry = new ViewRegistry();
+  private router: AppRouter | null = null;
+  private stateManager: StateManager | null = null;
+
   public static styles = [
     cssManager.defaultStyles,
     css`
@@ -155,6 +173,15 @@ export class DeesAppuiBase extends DeesElement {
         position: relative;
         z-index: 1;
       }
+
+      /* View container for dynamically loaded views */
+      .view-container {
+        display: contents;
+      }
+
+      .view-container:empty {
+        display: none;
+      }
     `,
   ];
 
@@ -200,6 +227,7 @@ export class DeesAppuiBase extends DeesElement {
         <dees-appui-maincontent
           .tabs=${this.maincontentTabs}
         >
+          <div class="view-container"></div>
           <slot name="maincontent"></slot>
         </dees-appui-maincontent>
         <dees-appui-activitylog></dees-appui-activitylog>
@@ -214,6 +242,24 @@ export class DeesAppuiBase extends DeesElement {
     this.secondarymenu = this.shadowRoot.querySelector('dees-appui-secondarymenu');
     this.maincontent = this.shadowRoot.querySelector('dees-appui-maincontent');
     this.activitylog = this.shadowRoot.querySelector('dees-appui-activitylog');
+
+    // Initialize from config if provided
+    if (this.config) {
+      this.applyConfig(this.config);
+
+      // Restore state if enabled
+      if (this.config.statePersistence?.enabled) {
+        this.loadState();
+      }
+
+      // Initialize router after state restore
+      this.router?.init();
+    }
+  }
+
+  async disconnectedCallback() {
+    await super.disconnectedCallback();
+    this.router?.destroy();
   }
 
   // Event handlers for appbar
@@ -295,4 +341,242 @@ export class DeesAppuiBase extends DeesElement {
       composed: true
     }));
   }
+
+  // ==========================================
+  // NEW: Public methods for unified config API
+  // ==========================================
+
+  /**
+   * Configure the app shell with a unified config object
+   */
+  public configure(config: interfaces.IAppConfig): void {
+    this.config = config;
+    this.applyConfig(config);
+  }
+
+  /**
+   * Navigate to a view by ID
+   */
+  public navigateToView(viewId: string): boolean {
+    if (this.router) {
+      return this.router.navigate(viewId);
+    }
+
+    // Fallback for non-routed mode
+    const view = this.viewRegistry.get(viewId);
+    if (view) {
+      this.loadView(view);
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Get the current view
+   */
+  public getCurrentView(): interfaces.IViewDefinition | undefined {
+    return this.currentView;
+  }
+
+  /**
+   * Get UI state for serialization
+   */
+  public getUIState(): interfaces.IAppUIState {
+    return {
+      currentViewId: this.currentView?.id,
+      mainMenuCollapsed: this.mainmenuCollapsed,
+      secondaryMenuCollapsed: this.secondarymenuCollapsed,
+      secondaryMenuSelectedKey: this.secondarymenuSelectedItem?.key,
+      collapsedGroups: [], // TODO: Get from secondarymenu if needed
+      timestamp: Date.now(),
+    };
+  }
+
+  /**
+   * Restore UI state from a state object
+   */
+  public restoreUIState(state: interfaces.IAppUIState): void {
+    if (state.mainMenuCollapsed !== undefined) {
+      this.mainmenuCollapsed = state.mainMenuCollapsed;
+    }
+    if (state.secondaryMenuCollapsed !== undefined) {
+      this.secondarymenuCollapsed = state.secondaryMenuCollapsed;
+    }
+    if (state.currentViewId) {
+      this.navigateToView(state.currentViewId);
+    }
+  }
+
+  /**
+   * Save current UI state
+   */
+  public saveState(): void {
+    this.stateManager?.save(this.getUIState());
+  }
+
+  /**
+   * Load and restore saved UI state
+   */
+  public loadState(): boolean {
+    const state = this.stateManager?.load();
+    if (state) {
+      this.restoreUIState(state);
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Get access to the view registry
+   */
+  public getViewRegistry(): ViewRegistry {
+    return this.viewRegistry;
+  }
+
+  /**
+   * Get access to the router
+   */
+  public getRouter(): AppRouter | null {
+    return this.router;
+  }
+
+  // ==========================================
+  // NEW: Private helper methods
+  // ==========================================
+
+  private applyConfig(config: interfaces.IAppConfig): void {
+    // Register views
+    if (config.views) {
+      this.viewRegistry.clear();
+      this.viewRegistry.registerAll(config.views);
+    }
+
+    // Apply branding
+    if (config.branding) {
+      this.mainmenuLogoIcon = config.branding.logoIcon || '';
+      this.mainmenuLogoText = config.branding.logoText || '';
+    }
+
+    // Apply app bar config
+    if (config.appBar) {
+      this.appbarMenuItems = config.appBar.menuItems || [];
+      this.appbarBreadcrumbs = config.appBar.breadcrumbs || '';
+      this.appbarBreadcrumbSeparator = config.appBar.breadcrumbSeparator || ' > ';
+      this.appbarShowWindowControls = config.appBar.showWindowControls ?? true;
+      this.appbarShowSearch = config.appBar.showSearch ?? false;
+      this.appbarUser = config.appBar.user;
+      this.appbarProfileMenuItems = config.appBar.profileMenuItems || [];
+    }
+
+    // Build main menu from view references
+    if (config.mainMenu) {
+      this.mainmenuGroups = this.buildMainMenuGroups(config);
+      this.mainmenuBottomTabs = this.buildBottomTabs(config);
+    }
+
+    // Initialize state manager
+    if (config.statePersistence) {
+      this.stateManager = new StateManager(config.statePersistence);
+    }
+
+    // Initialize router
+    if (config.routing && config.routing.mode !== 'none') {
+      this.router = new AppRouter(config.routing, this.viewRegistry);
+      this.router.onRouteChange((viewId) => {
+        const view = this.viewRegistry.get(viewId);
+        if (view) {
+          this.loadView(view);
+        }
+      });
+    }
+
+    // Bind event callbacks
+    if (config.onViewChange) {
+      this.addEventListener('view-change', ((e: CustomEvent) => {
+        config.onViewChange!(e.detail.viewId, e.detail.view);
+      }) as EventListener);
+    }
+
+    if (config.onSearch) {
+      this.addEventListener('appbar-search-click', () => {
+        config.onSearch!();
+      });
+    }
+  }
+
+  private buildMainMenuGroups(config: interfaces.IAppConfig): interfaces.IMenuGroup[] {
+    if (!config.mainMenu?.sections) return [];
+
+    return config.mainMenu.sections.map((section) => ({
+      name: section.name,
+      tabs: section.views
+        .map((viewId) => {
+          const view = this.viewRegistry.get(viewId);
+          if (!view) {
+            console.warn(`View "${viewId}" not found in registry`);
+            return null;
+          }
+          return {
+            key: view.name,
+            iconName: view.iconName,
+            action: () => this.navigateToView(viewId),
+          };
+        })
+        .filter(Boolean) as interfaces.ITab[],
+    }));
+  }
+
+  private buildBottomTabs(config: interfaces.IAppConfig): interfaces.ITab[] {
+    if (!config.mainMenu?.bottomItems) return [];
+
+    return config.mainMenu.bottomItems
+      .map((viewId) => {
+        const view = this.viewRegistry.get(viewId);
+        if (!view) {
+          console.warn(`View "${viewId}" not found in registry`);
+          return null;
+        }
+        return {
+          key: view.name,
+          iconName: view.iconName,
+          action: () => this.navigateToView(viewId),
+        };
+      })
+      .filter(Boolean) as interfaces.ITab[];
+  }
+
+  private loadView(view: interfaces.IViewDefinition): void {
+    const previousView = this.currentView;
+    this.currentView = view;
+
+    // Update secondary menu
+    if (view.secondaryMenu) {
+      this.secondarymenuGroups = view.secondaryMenu;
+      this.secondarymenuHeading = view.name;
+    }
+
+    // Update content tabs
+    if (view.contentTabs) {
+      this.maincontentTabs = view.contentTabs;
+    }
+
+    // Render view content into the view container
+    const viewContainer = this.maincontent?.shadowRoot?.querySelector('.view-container')
+      || this.shadowRoot?.querySelector('.view-container');
+    if (viewContainer) {
+      this.viewRegistry.renderView(view.id, viewContainer as HTMLElement);
+    }
+
+    // Save state if configured
+    this.stateManager?.update({ currentViewId: view.id });
+
+    // Dispatch event
+    this.dispatchEvent(
+      new CustomEvent('view-change', {
+        detail: { viewId: view.id, view, previousView },
+        bubbles: true,
+        composed: true,
+      })
+    );
+  }
 }
diff --git a/ts_web/elements/00group-appui/dees-appui-base/index.ts b/ts_web/elements/00group-appui/dees-appui-base/index.ts
index 5298b3a..a7ed537 100644
--- a/ts_web/elements/00group-appui/dees-appui-base/index.ts
+++ b/ts_web/elements/00group-appui/dees-appui-base/index.ts
@@ -1 +1,4 @@
 export * from './dees-appui-base.js';
+export * from './view.registry.js';
+export * from './app.router.js';
+export * from './state.manager.js';
diff --git a/ts_web/elements/00group-appui/dees-appui-base/state.manager.ts b/ts_web/elements/00group-appui/dees-appui-base/state.manager.ts
new file mode 100644
index 0000000..5ed8d8a
--- /dev/null
+++ b/ts_web/elements/00group-appui/dees-appui-base/state.manager.ts
@@ -0,0 +1,185 @@
+import type { IStatePersistenceConfig, IAppUIState } from '../../interfaces/appconfig.js';
+
+/**
+ * Manager for persisting and restoring UI state
+ */
+export class StateManager {
+  private config: Required<IStatePersistenceConfig>;
+  private memoryStorage: Map<string, string> = new Map();
+
+  constructor(config: IStatePersistenceConfig = { enabled: false }) {
+    this.config = {
+      enabled: config.enabled,
+      storageKey: config.storageKey || 'dees-appui-state',
+      storage: config.storage || 'localStorage',
+      persist: {
+        mainMenuCollapsed: true,
+        secondaryMenuCollapsed: true,
+        selectedView: true,
+        secondaryMenuSelection: true,
+        collapsedGroups: true,
+        ...config.persist,
+      },
+    };
+  }
+
+  /**
+   * Check if state persistence is enabled
+   */
+  public isEnabled(): boolean {
+    return this.config.enabled;
+  }
+
+  /**
+   * Save current UI state
+   */
+  public save(state: Partial<IAppUIState>): void {
+    if (!this.config.enabled) return;
+
+    const existingState = this.load() || {};
+    const newState: IAppUIState = {
+      ...existingState,
+      timestamp: Date.now(),
+    };
+
+    // Only save what's configured
+    if (this.config.persist.selectedView && state.currentViewId !== undefined) {
+      newState.currentViewId = state.currentViewId;
+    }
+    if (this.config.persist.mainMenuCollapsed && state.mainMenuCollapsed !== undefined) {
+      newState.mainMenuCollapsed = state.mainMenuCollapsed;
+    }
+    if (this.config.persist.secondaryMenuCollapsed && state.secondaryMenuCollapsed !== undefined) {
+      newState.secondaryMenuCollapsed = state.secondaryMenuCollapsed;
+    }
+    if (this.config.persist.secondaryMenuSelection && state.secondaryMenuSelectedKey !== undefined) {
+      newState.secondaryMenuSelectedKey = state.secondaryMenuSelectedKey;
+    }
+    if (this.config.persist.collapsedGroups && state.collapsedGroups !== undefined) {
+      newState.collapsedGroups = state.collapsedGroups;
+    }
+
+    this.setItem(this.config.storageKey, JSON.stringify(newState));
+  }
+
+  /**
+   * Load persisted UI state
+   */
+  public load(): IAppUIState | null {
+    if (!this.config.enabled) return null;
+
+    try {
+      const data = this.getItem(this.config.storageKey);
+      if (!data) return null;
+      return JSON.parse(data) as IAppUIState;
+    } catch (e) {
+      console.warn('Failed to load UI state:', e);
+      return null;
+    }
+  }
+
+  /**
+   * Clear persisted state
+   */
+  public clear(): void {
+    this.removeItem(this.config.storageKey);
+  }
+
+  /**
+   * Check if state exists
+   */
+  public hasState(): boolean {
+    return this.getItem(this.config.storageKey) !== null;
+  }
+
+  /**
+   * Get state age in milliseconds
+   */
+  public getStateAge(): number | null {
+    const state = this.load();
+    if (!state?.timestamp) return null;
+    return Date.now() - state.timestamp;
+  }
+
+  /**
+   * Update specific state properties
+   */
+  public update(updates: Partial<IAppUIState>): void {
+    const currentState = this.load() || {};
+    this.save({ ...currentState, ...updates });
+  }
+
+  /**
+   * Get the storage key being used
+   */
+  public getStorageKey(): string {
+    return this.config.storageKey;
+  }
+
+  // Storage abstraction methods
+
+  private getItem(key: string): string | null {
+    switch (this.config.storage) {
+      case 'localStorage':
+        try {
+          return localStorage.getItem(key);
+        } catch {
+          return null;
+        }
+      case 'sessionStorage':
+        try {
+          return sessionStorage.getItem(key);
+        } catch {
+          return null;
+        }
+      case 'memory':
+        return this.memoryStorage.get(key) || null;
+      default:
+        return null;
+    }
+  }
+
+  private setItem(key: string, value: string): void {
+    switch (this.config.storage) {
+      case 'localStorage':
+        try {
+          localStorage.setItem(key, value);
+        } catch (e) {
+          console.warn('Failed to save to localStorage:', e);
+        }
+        break;
+      case 'sessionStorage':
+        try {
+          sessionStorage.setItem(key, value);
+        } catch (e) {
+          console.warn('Failed to save to sessionStorage:', e);
+        }
+        break;
+      case 'memory':
+        this.memoryStorage.set(key, value);
+        break;
+    }
+  }
+
+  private removeItem(key: string): void {
+    switch (this.config.storage) {
+      case 'localStorage':
+        try {
+          localStorage.removeItem(key);
+        } catch {
+          // Ignore
+        }
+        break;
+      case 'sessionStorage':
+        try {
+          sessionStorage.removeItem(key);
+        } catch {
+          // Ignore
+        }
+        break;
+      case 'memory':
+        this.memoryStorage.delete(key);
+        break;
+    }
+  }
+}
diff --git a/ts_web/elements/00group-appui/dees-appui-base/view.registry.ts b/ts_web/elements/00group-appui/dees-appui-base/view.registry.ts
new file mode 100644
index 0000000..6c7b627
--- /dev/null
+++ b/ts_web/elements/00group-appui/dees-appui-base/view.registry.ts
@@ -0,0 +1,167 @@
+import { html, render, type TemplateResult } from '@design.estate/dees-element';
+import type { IViewDefinition } from '../../interfaces/appconfig.js';
+
+/**
+ * Registry for managing views and their lifecycle
+ */
+export class ViewRegistry {
+  private views: Map<string, IViewDefinition> = new Map();
+  private instances: Map<string, HTMLElement> = new Map();
+  private currentViewId: string | null = null;
+
+  /**
+   * Register a single view
+   */
+  public register(view: IViewDefinition): void {
+    if (this.views.has(view.id)) {
+      console.warn(`View with id "${view.id}" already registered. Overwriting.`);
+    }
+    this.views.set(view.id, view);
+  }
+
+  /**
+   * Register multiple views
+   */
+  public registerAll(views: IViewDefinition[]): void {
+    views.forEach((view) => this.register(view));
+  }
+
+  /**
+   * Get a view definition by ID
+   */
+  public get(viewId: string): IViewDefinition | undefined {
+    return this.views.get(viewId);
+  }
+
+  /**
+   * Get all registered view IDs
+   */
+  public getViewIds(): string[] {
+    return Array.from(this.views.keys());
+  }
+
+  /**
+   * Get all views
+   */
+  public getAll(): IViewDefinition[] {
+    return Array.from(this.views.values());
+  }
+
+  /**
+   * Get route for a view
+   */
+  public getRoute(viewId: string): string {
+    const view = this.views.get(viewId);
+    return view?.route || view?.id || '';
+  }
+
+  /**
+   * Find view by route
+   */
+  public findByRoute(route: string): IViewDefinition | undefined {
+    for (const view of this.views.values()) {
+      const viewRoute = view.route || view.id;
+      if (viewRoute === route) {
+        return view;
+      }
+    }
+    return undefined;
+  }
+
+  /**
+   * Render a view's content into a container
+   */
+  public renderView(viewId: string, container: HTMLElement): HTMLElement | null {
+    const view = this.views.get(viewId);
+    if (!view) {
+      console.error(`View "${viewId}" not found in registry`);
+      return null;
+    }
+
+    // Clear container
+    container.innerHTML = '';
+
+    let element: HTMLElement;
+
+    if (typeof view.content === 'string') {
+      // Tag name string
+      element = document.createElement(view.content);
+    } else if (typeof view.content === 'function') {
+      // Check if it's a class constructor or template function
+      if (view.content.prototype instanceof HTMLElement) {
+        // Element class constructor
+        element = new (view.content as new () => HTMLElement)();
+      } else {
+        // Template function - wrap in a container and use Lit's render
+        const wrapper = document.createElement('div');
+        wrapper.className = 'view-content-wrapper';
+        wrapper.style.cssText = 'display: contents;';
+        const template = (view.content as () => TemplateResult)();
+        render(template, wrapper);
+        element = wrapper;
+      }
+    } else {
+      console.error(`Invalid content type for view "${viewId}"`);
+      return null;
+    }
+
+    container.appendChild(element);
+    this.instances.set(viewId, element);
+    this.currentViewId = viewId;
+
+    return element;
+  }
+
+  /**
+   * Get currently active view ID
+   */
+  public getCurrentViewId(): string | null {
+    return this.currentViewId;
+  }
+
+  /**
+   * Get cached instance of a view
+   */
+  public getInstance(viewId: string): HTMLElement | undefined {
+    return this.instances.get(viewId);
+  }
+
+  /**
+   * Clear all instances
+   */
+  public clearInstances(): void {
+    this.instances.clear();
+    this.currentViewId = null;
+  }
+
+  /**
+   * Unregister a view
+   */
+  public unregister(viewId: string): boolean {
+    this.instances.delete(viewId);
+    return this.views.delete(viewId);
+  }
+
+  /**
+   * Clear the registry
+   */
+  public clear(): void {
+    this.views.clear();
+    this.instances.clear();
+    this.currentViewId = null;
+  }
+
+  /**
+   * Check if a view is registered
+   */
+  public has(viewId: string): boolean {
+    return this.views.has(viewId);
+  }
+
+  /**
+   * Get the number of registered views
+   */
+  public get size(): number {
+    return this.views.size;
+  }
+}
diff --git a/ts_web/elements/interfaces/appconfig.ts b/ts_web/elements/interfaces/appconfig.ts
new file mode 100644
index 0000000..8d12252
--- /dev/null
+++ b/ts_web/elements/interfaces/appconfig.ts
@@ -0,0 +1,189 @@
+import type { TemplateResult } from '@design.estate/dees-element';
+import type { IAppBarMenuItem } from './appbarmenuitem.js';
+import type { ITab } from './tab.js';
+import type { ISecondaryMenuGroup } from './secondarymenu.js';
+
+/**
+ * User configuration for the app bar
+ */
+export interface IAppUser {
+  name: string;
+  email?: string;
+  avatar?: string;
+  status?: 'online' | 'offline' | 'busy' | 'away';
+}
+
+/**
+ * View definition for the view registry
+ */
+export interface IViewDefinition {
+  /** Unique identifier for routing */
+  id: string;
+  /** Display name */
+  name: string;
+  /** Optional icon */
+  iconName?: string;
+  /** The view content - can be a tag name, element class, or template function */
+  content: string | (new () => HTMLElement) | (() => TemplateResult);
+  /** Secondary menu items specific to this view */
+  secondaryMenu?: ISecondaryMenuGroup[];
+  /** Content tabs specific to this view */
+  contentTabs?: ITab[];
+  /** Optional route path (defaults to id) */
+  route?: string;
+  /** Badge to show on menu item */
+  badge?: string | number;
+  badgeVariant?: 'default' | 'success' | 'warning' | 'error';
+}
+
+/**
+ * Main menu section with view references
+ */
+export interface IMainMenuSection {
+  /** Section name (optional for ungrouped) */
+  name?: string;
+  /** Views in this section (by ID reference) */
+  views: string[];
+}
+
+/**
+ * Main menu configuration
+ */
+export interface IMainMenuConfig {
+  /** Menu sections with view references */
+  sections?: IMainMenuSection[];
+  /** Bottom pinned items (view IDs) */
+  bottomItems?: string[];
+}
+
+/**
+ * App bar configuration
+ */
+export interface IAppBarConfig {
+  menuItems?: IAppBarMenuItem[];
+  breadcrumbs?: string;
+  breadcrumbSeparator?: string;
+  showWindowControls?: boolean;
+  showSearch?: boolean;
+  user?: IAppUser;
+  profileMenuItems?: IAppBarMenuItem[];
+}
+
+/**
+ * Branding configuration
+ */
+export interface IBrandingConfig {
+  logoIcon?: string;
+  logoText?: string;
+}
+
+/**
+ * Routing configuration
+ */
+export interface IRoutingConfig {
+  /** Routing mode */
+  mode: 'hash' | 'history' | 'external' | 'none';
+  /** Base path for history mode */
+  basePath?: string;
+  /** Default view ID to show on startup */
+  defaultView?: string;
+  /** Sync URL on view change */
+  syncUrl?: boolean;
+  /** Handle 404s - show view ID or callback */
+  notFound?: string | (() => void);
+}
+
+/**
+ * State persistence configuration
+ */
+export interface IStatePersistenceConfig {
+  /** Enable state persistence */
+  enabled: boolean;
+  /** Storage key prefix */
+  storageKey?: string;
+  /** Storage type */
+  storage?: 'localStorage' | 'sessionStorage' | 'memory';
+  /** What to persist */
+  persist?: {
+    mainMenuCollapsed?: boolean;
+    secondaryMenuCollapsed?: boolean;
+    selectedView?: boolean;
+    secondaryMenuSelection?: boolean;
+    collapsedGroups?: boolean;
+  };
+}
+
+/**
+ * Activity log configuration
+ */
+export interface IActivityLogConfig {
+  enabled?: boolean;
+  width?: number;
+}
+
+/**
+ * Main unified configuration interface for dees-appui-base
+ */
+export interface IAppConfig {
+  /** Application branding */
+  branding?: IBrandingConfig;
+
+  /** App bar configuration */
+  appBar?: IAppBarConfig;
+
+  /** View definitions (the registry) */
+  views: IViewDefinition[];
+
+  /** Main menu structure */
+  mainMenu?: IMainMenuConfig;
+
+  /** Routing configuration */
+  routing?: IRoutingConfig;
+
+  /** State persistence configuration */
+  statePersistence?: IStatePersistenceConfig;
+
+  /** Activity log configuration */
+  activityLog?: IActivityLogConfig;
+
+  /** Event callbacks (optional shorthand) */
+  onViewChange?: (viewId: string, view: IViewDefinition) => void;
+  onSearch?: () => void;
+}
+
+/**
+ * Serialized UI state for persistence
+ */
+export interface IAppUIState {
+  /** Current view ID */
+  currentViewId?: string;
+  /** Main menu collapsed state */
+  mainMenuCollapsed?: boolean;
+  /** Secondary menu collapsed state */
+  secondaryMenuCollapsed?: boolean;
+  /** Selected secondary menu item key */
+  secondaryMenuSelectedKey?: string;
+  /** Collapsed group names in secondary menu */
+  collapsedGroups?: string[];
+  /** Timestamp of last save */
+  timestamp?: number;
+}
+
+/**
+ * Route change event detail
+ */
+export interface IRouteChangeEvent {
+  viewId: string;
+  previousViewId: string | null;
+  params?: Record<string, string>;
+  source: 'navigation' | 'popstate' | 'initial' | 'programmatic';
+}
+
+/**
+ * View change event detail
+ */
+export interface IViewChangeEvent {
+  viewId: string;
+  view: IViewDefinition;
+  previousView?: IViewDefinition;
+}
diff --git a/ts_web/elements/interfaces/index.ts b/ts_web/elements/interfaces/index.ts
index 009fd4c..1536930 100644
--- a/ts_web/elements/interfaces/index.ts
+++ b/ts_web/elements/interfaces/index.ts
@@ -3,3 +3,4 @@ export * from './selectionoption.js';
 export * from './appbarmenuitem.js';
 export * from './menugroup.js';
 export * from './secondarymenu.js';
+export * from './appconfig.js';