62.114.1.230: how two go engines play ? (2006-06-21 14:03) [#1746]

Good morning...I want to ask a question...if we want two GO engines to play againest each other(both supporting GTP)...how shall this be done? for example if I want 2 instances of GNUgo or POCKET GNU GO to play againest each other on the same machine...how shall I do that..?