xfce4 had overwritten kde

[Joe Mc Cool <joe@benburb.demon.co.uk>]

Oh dear,

on my Debian sarge box I ran:

   apt-get install xfce4

since that, when ANY user logs in to a kdm prompt, they are presented 
with xfce4 instead of kde.

I had really only intended xfce4 for my own personal use.

How can I rectify this elegantly please ?

Joe
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