Is there a way I could play people online with this Emulator
Yes there is! It is touchy though.
As long as you have a buddy that can spend a bit testing out the configuration options and whatnot you can usually get online. I've gotten it to work myself, but the online functions for most emulators are sketchy at best so problems should be expected.
A brief check of their website tells me though that they only appear to have gotten Super Mario World to work with this thing. I think I played Wario's Woods or something similar.
I want to play Super Mario Kart with a friend
Well I don't know if it will work or not; however, you can most certainly give it a shot.
That explains a lot. :P I tried desperately to get the online features to work with ZSNES, but couldn't figure them out. I once got the game link feature of a gameboy emu to work, but I had two instances of the emulator open on the same computer, so it didn't have the same effect.
I never could figure out online play for ZSNES. I do play Netplay on Kawaks though, many people play King of Fighters and Marvel vs. Capcom.
Most of the online functions for emulators are sketchy at best. The most successful once I've seen was Netplay for 1964 which is an N64 emulator. NNNesterJ, for the NES, also has good online multiplayer functionality and I was able to play a few racing games and a modded version of River City Ransom.
Seems that the SNES emulators, for all of their positive points, are somewhat lacking in terms of online support. I know that it works, but it's really hit and miss (like most emulators) and what works on my system may not work on yours.
For Zsnesw I remember playing it with a friend online but we needed to know each others IP numbers and then connect. After that though it was a long night of super mario kart....great emu memories...