Platform UI Command Design
Commands and Handlers
Commands are managed by the org.eclipse.ui.commands extension point and the ICommandService.
Handlers are managed by the org.eclipse.ui.handlers extension point and the IHandlerService.
KeyBindings and Contexts
KeyBindings are managed by the org.eclipse.ui.bindings extension point and the IBindingService.
Contexts are managed by the org.eclipse.ui.contexts extension point and the IContextService.
Currently, menus are managed by 4 extension points:
Programmatic contributions are managed through a number of locations: IActionBars, IViewSite, IEditorSite ... more to follow