If you're talking about script, this would do it:
void ActivatePortal(object oTarget, string sIPaddress = "", string sPassword = "",
string sWaypointTag = "", int bSeamless = FALSE);
oTarget - PC of the client to transfer.
sIPaddress - DNS name or IP address (and optional port) of new server.
sPassword - Password for login to the destination server.
sWaypointTag - If set, arriving PCs will jump to this waypoint after appearing at the start location.
bSeamless - If TRUE, the transition will be made 'seamless', and the PC will not get a dialogue box on transfer.