retroarch netplay worked very well for me. Hosted a game on one PC, it appeared in the online game browser, joined it from the 2nd PC. In addition, it's very

retroarch netplay worked very well for me. Hosted a game on one PC, it appeared in the online game browser, joined it from the 2nd PC. In addition, it's very easy to have your rom inside the retroarch folder, then send the whole folder to another person / computer. That way there is no confusion about rom versions, in addition you can pre-configure the controls if the person you're sending the folder to isn't as tech savy.