Switching a newly-installed PC from Gnome to XFCE?

[Omer Zak]

I made a new installation of Debian Squeeze.
Debian installer, by default, installed Gnome.
I would like to economize on RAM usage, so I installed the packages of
XFCE.

However, after installation, I see in gdm's login screen no way to
switch desktops from Gnome to another desktop (such as KDE or XFCE).  I
remember that there used to be such a dialog in the past.

Currently, in the new installation, the gdm login screen has buttons
only for shutdown options and for turning on accessibility provisions.

Can anyone please remind how to access the desktop switching dialog from
gdm's login screen (if possible at all)?
Which additional package/s do I need to install to get this dialog?

Thanks,
--- Omer Zak


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