Create a file in /etc/X11/gdm/Sessions called "Afterstep" (warning, I
can't remember for sure that this is where this directory was in RH 7.3, but
I'm almost completely sure - I don't think they moved it between 7.3 and 8.0.
If /etc/X11/gdm/Sessions doesn't exist, type "locate gdm/Sessions" and put
the Afterstep file there - the most likely alternative location would be
/etc/gdm/Sessions.) Put the following lines in the "Afterstep" file:
#!/bin/bash
exec /etc/X11/xdm/Xsession afterstep
(2) Now create a file in /usr/share/apps/switchdesk called
"Xclients.afterstep". (again if there is no /usr/share/apps/switchdesk
directory try "locate apps/switchdesk" - but I'm 99% sure it's in the
location I've indicated in RH 7.3). Put the following in that file:
(3) Restart gdm. Afterstep should be in the list of sessions to choose from.
Choose it and log in, you should get Afterstep. If for some reason this
doesn't work please let me know, I don't think I've forgotten anyting but...