org.eclipse.ui.commands
Interfaces 
ICategory
ICategoryListener
ICommand
ICommandListener
ICommandManager
ICommandManagerListener
ICommandService
IHandler
IHandlerListener
IKeyConfiguration
IKeyConfigurationListener
IKeySequenceBinding
IWorkbenchCommandSupport
Classes 
AbstractHandler
ActionHandler
CategoryEvent
CommandEvent
CommandManagerEvent
ExtensionParameterValues
HandlerEvent
HandlerSubmission
KeyConfigurationEvent
Priority
Exceptions 
CommandException
ExecutionException
NotDefinedException
NotHandledException