- How to play Heroes 3 online.

Now everyone uses TeamViewer. What's the problem? If the stream quality isn't good enough, try making one, but you need good hardware and it's a hassle to set up...

Well, then all the interest disappears. What's the point of playing cooperatively online if you can't see your partner's battles? That's the most interesting part. So, we'll just keep struggling with TeamViewer.
P.S. The other day, we tried playing Heroes 4 through TeamViewer using remote access, and the lag situation was even worse. In Heroes 3, it was still possible to play somehow, but in Heroes 4, it's completely unplayable.