Bergil 说:
If you wanted seperate armies and the like that would be far harder to implement I'm sure.
Yeah, I imagine co-op being two players playing single player in the same lobby, not just drop-in.
It can work. If a player is in a town for example, their party is shown added to the garrison like any AI lord's party would be. If the town is besieged, that player's party can help defend (unless they're neutral) or leave like in singleplayer Warband.
Battles would take place on the world map, and last as long as the battle would last in real-time. Parties wouldn't join the real-time battle if they pass by on the world map, and other players couldn't join the battle either.
Only if all players are engaged in a battle, either separately or altogether in one, would the world map pause, because there's no need to keep the world map running if all players are in the battle mapmode.
There's just a few ideas.