My girlfriend really likes old school NES games, and she has a DS. I figured the best way to get her games would be to install a NES emulator like NESDS on her DS. Having no experience with this, I googled for instructions, but they are a little beyond my understanding. I didn't think there was a way to 'upload' executables or files to the DS, but maybe I'm wrong.

Essentially, how do I get NESDS onto a DS system? Secondly, how do I get ROMs onto the system as well (I assume the same way).