mods question

[Bann]

I find myself wondering about mods and online games. Heres a hypothetical: I've downloaded Worthy Heroes and CBM. I connect to a network game from Gandalfs server. Does the game I connect too automatically enable/disable whatever mods are specificed for that game? Or must the player enable/disable the correct mods before connecting to the server and playing his turn? What happens if a player connects to a game that requires a mod but that player does not have said mod?