By default fvwm2 starts xterm -- why?

[Andreas Tille <e2od5@mlucom.urz.uni-halle.de>]

Hi,

I wonder why fvwm2 starts a xterm when starting.  I didn't found any
call of xterm while browsing through the startup files in /etc/X11/fvwm2.

What should I do if I want to avoid this or what should I do to if I
prefer rxvt with a geometry different from the standard size?

Thanks for advise

   Andreas.