How Auto Start Greeter on Ctrl-Alt-F8?

[John Thomas <gmane-2006-04-16@xxxxxxxxxxxx>]

Ctrl-Alt-F7 automatically starts with a gdm greeter.  I would like 
Ctrl-Alt-F8 to be the same, but I cannot figure it out.  Would you offer 
some tips?

The purpose is to allow others to simply switch over and log into a 
machine without bothering the current X session and/or leaving me logged 
in the F8 so X is running and waiting for me.
--
Sincerely,
John Thomas
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