I tried to run Gens and was surprised to see that the network module Kaillera seems to be working fine.
Unfortunately, playing emulators online has fallen out of fashion, and I am just hurting myself thinking about the good old days^TM , when you could enjoy a nice 4 players Mega Bomberman with kind strangers, late into the night. sigh ...
Don't be. Grab Gens here ... best one for Windows. If U are using Windows anyways. Plays it all. Genesis, Master System, Sega CD ... works great with mouse as gun!
My friends and I installed GENS on ours, and connected to each other over the network (maybe the internet, I don't exactly recall). Every time this bad boy rolled into our room, we spent the entire class period playing multiplayer Sega Genesis games. Golden Axe is the one I remember best. The real scam of it was, from a distance, it must have looked like we were hard at work.