what to do now? (was: Re: Graceful termination again)

[Enrico Sersale]

GWorkspace, if used in the role of NSWorkspace "workspace application" can now 
return in -launchedApplications the list of all the running apps.
As a side effect of this and of all the work that Richard has done in 
NSWorkspace, NSApplication, etc.., we have now also a working implementation of 
-hideOtherApplications: and -unhideAllApplications:.

But now my problem is how to implement all the "graceful termination" stuff; I suppose 
that I should add a "Logout" menu and send a NSWorkspaceWillPowerOffNotification through 
the NSWorkspace notification center; but, unlike NSApplicationWillTerminateNotification, for 
NSWorkspaceWillPowerOffNotification you must explicitly add your application delegate as a observer 
of this notification; this means that *all* the actually existing GNUstep applications will not 
work...
Moreover, I can't find any Apple documentation about this.
Last question: which is the role of -extendPowerOffBy: in all this mechanism?