nsICommandManager
Methods
addCommandObserver(aCommandObserver, aCommandToObserve)
removeCommandObserver(aCommandObserver, aCommandObserved)
isCommandSupported(aCommandName, aTargetWindow)
isCommandEnabled(aCommandName, aTargetWindow)
getCommandState(aCommandName, aTargetWindow, aCommandParams)
doCommand(aCommandName, aCommandParams, aTargetWindow)