can you specify some stuff like
in the main building, are they connected to a HUB, or a server or what?
is it not possible to keep all the computers under the same workgroup ?
if u use a server in the main building, what OS does it have?
im guessing there must be a server, so u can just make a shared folder on it. then, if anyone wants to share a file, they can put it in there.
if u can make all computers under one workgroup, make sure they all got diff names and then they can all be part of one lan and can see each other in the network places or network neighbourhood.
but why cant they access each other? is it technically not happening or you dont want it to happen ?