Good question! Today I tried to play via HEAT a network game, but it didn't work! Maybe it's because of the speed add-on, but maybe it can be because I have a cablemodem and the other guy didn't.
Anybody who can tell....?

This patch is a dbi file and to play multiplayer games, both players need identical dbi files, so in this case, both players would need the file to play.

What happens when I play against someone with the modem and I have the speed add-on and the other guy not?

What did go wrong