# Part III. Muffin Core Reference

Table of Contents

Main — Program startup.
Common — Muffin common types
Preferences — Muffin preferences
Utility functions — Miscellaneous utility functions
Errors — Muffin X error handling
MetaPlugin — Entry point for plugins
MetaRectangle — Simple box operations
MetaCompositor — Compositor API
MetaDisplay — Handles operations on an X display.
MetaGroup — Muffin window groups
MetaKeybinding — Key bindings
MetaBackgroundActor — Actor for painting the root window background
MetaShadowFactory — Create and cache shadow textures for arbitrary window shapes
MetaShapedTexture — An actor to draw a masked texture.
MetaWindowActor — An actor representing a top-level window in the scene graph
MetaScreen — Muffin X screen handler
MetaWindow — Muffin X managed windows
MetaWorkspace — Workspaces

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