gdm Question (I think)

[Jay Kelly]

Hello Guys,
I'm currently using Gnome and starting it with "startx" I changed the
.xsession so that O could start it from the console but when it starts I am
no longer asked for a login name and pass. I want to be able to start gdm (I
think that's what it is) so I have a choice to select from Gnome or Debian
or Xwindows. Any idea's how I can accomplish this?