Katryn Anderson proposed following entry to
/usr/share/apps/kdm/sessions if you're using the
KDM login manager:
----------------------------------------------------------
[Desktop Entry]
Encoding=UTF-8 
Type=XSession
Exec=wmi
TryExec=wmi
Name=WMI
Name[xx]=xxWMIxx
Comment=Window-Manager Improved
Comment[xx]=xxWindow-Manager Improvedxxxxxxxxxxxxxxxxxxx
----------------------------------------------------------
