Question: zsnes how to use netplay?
Answer: Open ZSNES 1.42.
Open the Load window. Direct the person you plan to play with to do the same. ... 
Open NETPLAY window. ( NETPLAY/INTERNET) ... 
Starting a Game. As host you will have seen the ZSNES TERMINAL open, displaying some information about your server. ... 
Have Fun! (Playing the game, of course!)