For online play, you need:
a second set of heroes;
internet access;
ICQ;
download the free Hamachi program;
2-4 hours of free time, or more, depending on the map;
be prepared to play the "Slagfest" map or any other map by agreement with your opponent;
an opponent;
connect with your opponent via Hamachi.
Don't forget to set "Compatibility with Windows 95" through the Heroes shortcut.
According to standard rules, the game is played at the chess rook level.
Among the players in Heroes II online, Gynnar is most often present in the network.