Yea so title says it all: It would seem the multiplayer option has been removed from the gog version of barony.
You have to use 3'd party software to play with your friends.
Why is this the case!? I mean i know its cheaper than the steam version but come on we paid for this!
EDIT: Ok found out you just have to port forward, and do the direct connect through the "LAN lobby" browser. I may have overreacted slightly.