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# Common Libraries — Overview

Shared libraries beyond the core exec/dos/graphics/intuition subsystems. These provide utility functions, file format parsing, hardware expansion support, and Workbench integration.

## Section Index

| File | Description |
|---|---|
| [utility.md](utility.md) | TagItem lists with chaining (TAG_MORE), callback hooks (register convention), date/time utilities, tag iteration patterns |
| [expansion.md](expansion.md) | Zorro II/III bus architecture, AutoConfig ROM layout, board enumeration, FPGA implementation notes |
| [icon.md](icon.md) | Workbench icons (.info): DiskObject structure, ToolType parsing, icon types, OS 3.5+ true-colour icons |
| [workbench.md](workbench.md) | Workbench integration: WBStartup handling, AppWindow drag-and-drop, AppIcon, AppMenuItem |
| [iffparse.md](iffparse.md) | IFF file parsing: ILBM/8SVX/ANIM, BitMapHeader, ByteRun1 compression, clipboard integration |
| [locale.md](locale.md) | Internationalisation: catalogue system (.cd/.ct files), locale-aware date/number formatting, character classification |
| [keymap.md](keymap.md) | Keyboard mapping: raw-to-ASCII translation, KeyMap structure, dead keys, rawkey codes, national layouts |
| [rexxsyslib.md](rexxsyslib.md) | ARexx scripting: hosting ARexx ports, command parsing, sending commands, return codes |
| [mathffp.md](mathffp.md) | Motorola FFP and IEEE 754 floating point |
| [layers.md](layers.md) | Window clipping: ClipRect engine, Simple/Smart/Super refresh, damage repair, backfill hooks, layer locking |
| [diskfont.md](diskfont.md) | Disk-based fonts: FONTS: directory structure, AvailFonts enumeration, colour fonts (OS 3.0+) |