"Connects a PC parallel port to the NES control port, schematic included. It allows you control a game with a PC keyboard to log and play back button presses."
"This is PC to NES transfer cable, it uses the PC parallel port and NES gamepad port. Transfer cable is compatible with standard printerport protocoll, but others should work too!"
"Currently lptnes.exe runs under MS-DOS, it works also under win9x and ME. Newer releases of windows such as win2000, XP and Vista are NOT supported."
"Q: Does LPTNES work with USB to LPT adapter? A: Probably not."
* Ability to "save and load" in your favorite NES games, even if the game has no save feature!