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1. You can find the emulator at the site of Richard Bannister
2. Planet Emu has lots of games for the Neo Geo Pocket
(note: probably you will have to own the original to play a rom)
3. The emulator works simple, You download it as a disk image. When it opens, you just install it by copying it into Applications, and just running the App.
5. When you start the programme, you can just select a game you have downloaded, Keys are set to the cursor, shift and option keys.
e voila...