This is one of my more knowledgeable areas. some of the older ones allow playback of cd-r games that are kind of a pair to burn (they are not cds but gcd but I won't get into the specifics) But on mine I have a sega geneses emulator, snes as well as a nes (I own all the systems and games legally). some emulators run nicer then others, the system also allows internet browsing though dial up (or Ethernet with a Ethernet module but they are alot $$ on ebay). Some of the games made on it are just windows ce programs since the console was designed to use windows ce apps.