kdm should automatically find that you have installed fluxbox and will display it as a choice.

fluxbox startup script

By this way it is not possible (at least in my Debian 3.1 Sarge with kdm) to use ~/.fluxbox/startup script, but in Debian 4.0 Etch it seems to work.

For Debian 3.1 Sarge, first edit /usr/share/xsessions/fluxbox.desktop:

 [Desktop Entry]
 Comment=Highly configurable and low resource X11 Window manager
 [Window Manager]

changing the bold lines: it's started /usr/bin/startfluxbox script, not just fluxbox. Finally edit ~/.fluxbox/startup:

 ## uncomment it to launch xscreensaver or idesk
 ##xscreensaver &
 ##idesk &
 exec /usr/bin/fluxbox

Now it is possible to start a fluxbox session from kdm and use the startup script ~/.fluxbox/startup to fit your needs.

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