On the box you want the application to appear on:

xhost +otherboxname

On the box the application runs on:
set DISPLAY environment variable (eg:  export
DISPLAY=displaybox:0)
then run application.

-swf
> I have 2 linux machines with both have xserver running
> on them.
> 
> Is there a way to get the display of one gui
> application to appear on the other box.?