OT: what is the X11 equiv of /dev/null

[Aryeh M. Friedman]

I often want to run applications from my PC (actually the dual boot 
partition on my desktop 7.1) on one of the X11 capable 7.1 machine at 
work (identical configs except for dual booting) and want to be able to 
open applications (like deluge) on the work machine that require a X11 
server... I was thinking is there someway to direct a X11 app to target 
the X11 equiv of /dev/null ?