Suspend/Resume X sessions?

[William O'Higgins Witteman]

On Fri, Mar 03, 2006 at 09:09:01PM -0500, James Knott wrote:
>William O'Higgins Witteman wrote:
>> Is it possible to log out of an X session, keeping everything active,
>> but making the machine available for someone else, and then later, log
>> back in to the same state?
>
>You don't have to log out, though you might want to lock the desktop.
>Linux supports up to 6 independent desktops.

I have now seen this suggestion twice - how do you "lock" your desktop?
I do it constantly at work, but I don't know how to do so on Linux.

Thanks to all for your suggestions, by the way, I've been reading up on
them and some look like good solutions.
-- 

yours,

William

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