~File types~

~Midi~ Music hehehe no really is the meaning of a             instrument (mostly keyboards) that are hock             up to a computer to play sounds or type of             music that is imported to the memory system             and convert to a .mid file which can be played             by or changed by the user.

~Mp3~ Sounds or music from a CD for example             that are imported to the computer memory             system (takes more bites then a .mid file)

~Emulator~ A program basicly that allows the user                   to play Snes or any console type games                   and yes even playstation and soon to                   be playstation 2!! (No it's not illegal                   well unless the internet police is after you)

~Roms~ A script that is for example a game that is             comand the same way it would in the console             Note - only catridge type games can be played             using a emulator. So if you download the             playstation emulator you wont find any             roms for it. But hey it beats paying for the             system.