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# Intuition — GUI Subsystem Overview

## Section Index

| File | Description |
|---|---|
| [intuition_base.md](intuition_base.md) | IntuitionBase structure and global state |
| [screens.md](screens.md) | Screen, OpenScreen, CloseScreen, SA_ tags |
| [windows.md](windows.md) | Window, OpenWindow, IDCMP messaging |
| [gadgets.md](gadgets.md) | Gadget structures, GadTools, BOOPSI |
| [menus.md](menus.md) | Menu, MenuItem, MenuStrip construction |
| [requesters.md](requesters.md) | EasyRequest, AutoRequest, file requesters |
| [idcmp.md](idcmp.md) | IDCMP message classes and IntuiMessage |
| [boopsi.md](boopsi.md) | BOOPSI object-oriented gadget system |
| [input_events.md](input_events.md) | InputEvent, input.device, commodities |