how do you play 2 people if possible on gba rom

cant fig it out ???(hopin it's possible) :)

I believe there is an emulator that can use 2 networked computers to emulate 2 GBs with a link cable; but I'm not sure beyond that.

http://www.vbalink.info/There most certainly is. :)

Doesn't NO$GBA do it too? How is that even possible?

I do not know if No cash GBA does it. It simply sends a long a players position and such. It doesn't work extremely well anyway.