NO$GBA emulator help

??? Well some games have cheats that say insert GBA rom into slot one or so. Can this be achieved with NO$GBA or do I need any other emulator if possible? Example for such a game would be FFTA2 which asks for FFTA gba rom.

no, it is not possible with emulators at this time.

I have tried loading a new screen with a NDS ROM loaded, and then with a needed GBA ROM loaded into the new screen (supposedly works for linking and such) but it doesn't work. There may be support for it in future no$gba releases.

Ok then. Next question. Do you know how to load two separate cartridges into same NO$GBA to link them. I mean I select 1st machine for one and second machine for the other but still both screens of emulator shows the same game

You can do it with GBA games, right click the screen to load another one, not sure if it works with NDS games. Try.