Internally initiated outbound X traffic

[John Larson <jlarson @ parc . xerox . com>]

A question has come up here whether there are any known security problems 
with allowing internally initiated X windows traffic to an external machine 
(ie. pop up an X-window tool on external machine).

Are there any known security problems with allowing X in the outbound
direction ?  

Thanks,

John Larson
Xerox PARC