found something

kdebase/kdm/ChangeLog

2003-09-23  Oswald Buddenhagen <ossi@kde.org>

        * Session types are now defined with .desktop files; consequently the
          SessionTypes option is gone and we got SessionsDirs instead.
        * The default Xsession now hard-wires the session types
          - "default" to startkde
          - "custom" to ~/.xsession

see also "Help"
Control Center Modules
Chapter 7. Supporting multiple window managers

BTW, the updated documentation apparently is only in CVSHEAD (but not in SUSE 
KDE3.4RC1 yet)
--
cu
ferdinand
 
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