'Let's play Heroes 5 online.'

Got it, thanks. And we're acting like idiots, trying to find each other in the game.)))
So, I create a Hamachi network, he connects to it... and we see each other in the game, right? :)
What if one person has version 3.0 and the other has version 3.1?
Do we definitely need to disable antivirus and firewall?