I'm trying to do a hot seat multiplayer game with a player by using teamviewer (also tried join.me) so that either of us can control the mouse during the game. However, the player that joins has issues with mouse control inside of the Heroes window. This happens whether we are in windowed or full screen mode, and only happens inside of Heroes, he is able to navigate my start menu, desktop, etc. just fine.

Does anyone have any ideas on how to address this? At first we thought it was the program, so we switched to teamviewer from join.me but the same thing occured. Then we compared mouse sensitivity and we had the same settings already.

Alternately, if anyone knows how to get a network game working through hamachi or whatever, we'd be okay with that too.

Between Hamachi and the built in DOSBox support, I believe you should be able to get this working. I've not actually tried with Heroes 2 myself though. It looks like there are actually links for hosting or joining network games as part of the installation, but in looking at the .conf files, I'm not convinced it will work properly, but that is definitely the first thing to try.

If that doesn't work, first you'll need to enable networking in DOSBox (ipx=true or something like that in the .conf file) Then one person will need to host with:

ipxnet startserver

The other will connect with:

ipxnet connect <ip address>

Now, the other issue to address is dealing with routers and whatnot. You can configure your router to forward the correct ports or just use Hamachi which is probably easier.

The DOSBox manual has additional details on configuration:
http://www.dosbox.com/DOSBoxManual.html