The term segment is used because each node that runs the bridge program does filter packets that should stay local. Ah, so the bridge program is not really a bridge (at least not in the way I use the word). Usually I think of a bridging two networks as meaning to copy all traffic from network A to network B and vice versa. If the box or program does something smart about deciding which traffic should go where, then it's a "router" (or at least a "switch"). How does the bridge program decide what DECnet messages to bridge and what to drop? Thanks, Bob