> ## Documentation Index
> Fetch the complete documentation index at: https://docs.debian.com.mx/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Discover Time Capsule - a Progressive Web App that recreates the 1990s Unix CDE desktop experience entirely in your browser

# Introduction to Time Capsule

<Note>
  You're not visiting a website. You just logged into a Unix workstation.
</Note>

Time Capsule is a faithful recreation of the **Unix Common Desktop Environment (CDE)** - the iconic desktop that powered workstations in the 1990s. Built as a Progressive Web App, it runs entirely in your browser with authentic visuals, behavior, and functionality.

## What is Time Capsule?

There was a time when desktops were heavy, monitors were beige, and opening a terminal felt powerful. Time Capsule brings that experience back - not as screenshots or mockups, but as a real, interactive desktop environment.

This is a complete recreation of the Unix CDE experience using modern web technologies. Every pixel, every color palette, every backdrop is authentic to the original system that ran on Sun Solaris, HP-UX, and IBM AIX workstations.

<CardGroup cols={2}>
  <Card title="Try it live" icon="globe" href="https://debian.com.mx">
    Experience Time Capsule in action
  </Card>

  <Card title="Quickstart guide" icon="rocket" href="/quickstart">
    Get started in 5 minutes
  </Card>
</CardGroup>

## Key features

### Authentic theming system

Time Capsule includes 76 authentic Motif color palettes and 168 original XPM backdrops from the 1990s. Every palette transforms your entire desktop - from window borders to buttons to the front panel.

**Popular palettes:**

* **Platinum** - Classic gray (the default CDE look)
* **Broica** - Warm browns and earth tones
* **Alpine** - Cool blues for a crisp appearance
* **Midnight** - Dark theme for low-light environments
* **Coalmine** - Very dark with high contrast

**Original backdrops:**

* **CircuitBoards** - Dithered tech patterns
* **BrokenIce** - Crystalline textures
* **Afternoon** - Warm geometric designs
* **Carpet** - Textile-inspired patterns
* **Arabesca** - Ornate decorative motifs

You can customize your theme and share it as a link. Your complete setup - colors, backdrop, fonts - can be exported and loaded by anyone instantly.

### Full-featured applications

<AccordionGroup>
  <Accordion title="XEmacs text editor">
    Real Emacs keybindings including `C-x C-s` (save), `M-x` (execute command), `C-k` (kill line), and `C-y` (yank). Features an interactive minibuffer, authentic GNU splash screen, and full text editing capabilities. Edit files in your virtual filesystem with the power of Emacs.
  </Accordion>

  <Accordion title="Terminal Lab">
    22 interactive Unix/Linux lessons that teach you by doing. Learn essential commands from `ls` to pipes, with instant feedback. Switch between tutorial mode (guided lessons) and free mode (full bash-like environment) with tab completion.
  </Accordion>

  <Accordion title="Virtual filesystem">
    A complete in-browser filesystem with O(1) path resolution. Create files, make directories, copy, move, and delete with full Unix-like path handling. All data persists using IndexedDB. Navigate with the File Manager or command line.
  </Accordion>

  <Accordion title="Netscape Navigator">
    Experience web browsing from 1994. Authentic interface with retro compatibility for exploring internal documentation and curated 90s-style content. Complete with navigation buttons, address bar, and bookmarks.
  </Accordion>

  <Accordion title="Man page viewer">
    28 essential Unix manual pages with authentic formatting and clickable examples. Browse documentation for commands like `ls`, `grep`, `find`, `chmod`, and more. Learn Unix the traditional way.
  </Accordion>
</AccordionGroup>

### System features

<CardGroup cols={2}>
  <Card title="Boot sequence" icon="power-off">
    Watch the system initialize with authentic Debian boot messages, just like a real Unix workstation
  </Card>

  <Card title="4 virtual workspaces" icon="th">
    Organize your work across four separate desktops. Switch with `Ctrl+Alt+1-4`
  </Card>

  <Card title="Window management" icon="window-maximize">
    Drag, resize, minimize, and maximize windows with smooth interactions and CDE-style controls
  </Card>

  <Card title="Keyboard shortcuts" icon="keyboard">
    20+ shortcuts for power users. Navigate and control everything without touching the mouse
  </Card>
</CardGroup>

### Progressive Web App

Time Capsule isn't just a website - it's a full Progressive Web App that can be installed on any device:

* **Offline access** - Works without internet after initial load
* **Native experience** - Runs in its own window without browser UI
* **Desktop integration** - Appears in your app launcher and taskbar
* **Automatic updates** - Always stays current with new features
* **Cross-platform** - Desktop, tablet, and mobile with touch gestures

<Tip>
  Click the "Install PWA" icon on the desktop to install Time Capsule as a native app. See the [PWA installation guide](/pwa-installation) for details.
</Tip>

## Why Time Capsule exists

The goal wasn't pixel perfection - it was experience authenticity. This project preserves computing history in an interactive, accessible format. You don't need to find old hardware or install virtualization software. Just open a browser.

Time Capsule is built for:

* **Nostalgia enthusiasts** who remember CDE workstations
* **Unix learners** who want hands-on command line practice
* **Design historians** studying 1990s interface design
* **Curious developers** interested in retro computing

## Technical foundation

Time Capsule is built with modern web technologies:

```typescript theme={null}
// Built on Astro's islands architecture
// Each application hydrates on demand
import { defineConfig } from 'astro/config';

export default defineConfig({
  // Static HTML shell with interactive islands
  integrations: [/* TypeScript, CSS, IndexedDB */]
});
```

**Architecture highlights:**

* **Astro** for static HTML with interactive islands
* **TypeScript** for type-safe application logic
* **IndexedDB** for persistent storage and virtual filesystem
* **Web Workers** for XPM image parsing and background tasks
* **Service Workers** for offline caching and PWA capabilities
* **Web Audio API** for authentic system beeps

The source code demonstrates event-driven communication, lazy loading, virtual scrolling for performance, and progressive enhancement throughout.

## Works everywhere

Desktop feels native. Mobile adapts with touch gestures. Keyboard shortcuts still work. The experience behaves like a real system - not a responsive layout pretending to be one.

<Info>
  Time Capsule is fully responsive. On mobile, use touch gestures to drag windows, tap to click, and swipe to navigate. On desktop, use keyboard shortcuts for maximum efficiency.
</Info>

## Open source

Time Capsule is open source and welcomes contributions:

* Add new color palettes or backdrops
* Improve accessibility features
* Fix bugs and optimize performance
* Create new applications
* Enhance documentation

The project is actively maintained on GitHub with a friendly community in discussions.

## Next steps

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Launch your first application in 5 minutes
  </Card>

  <Card title="PWA installation" icon="download" href="/pwa-installation">
    Install as a native app on any device
  </Card>
</CardGroup>

Ready to experience 1990s Unix computing? [Try Time Capsule now](https://debian.com.mx) or continue with the quickstart guide to learn the essential features.