UDP source port while doing broadcast

HIya All.. Had to take cover for some weeks and now im back on the rebol scripting again.. I hope someone had the answer because until now i was unable to set the source-port when doing a broadcast on UDP.. * Does rebol allow to set a source port for tcp/udp ? * If yes.. Does rebol check the availebility of the port? ( i have seen the rebol crew changed server port handling in the beta release of the /core ) Thanks in advance.. (R)egards, Norman