Saving the iconbox when I logout.

I'm running MWM under XDawin 1.4a1 (a version of XFree86 4.0) on a
Mac G5 with OS X 10.4.3.

On other systems I have used, the iconbox contents are saved when
I log out, so that they are regenerated when I log in again. I'm wondering
if it is possible to do this in my current configuration, and if so how.

Thankx for any assitance, Alan