The Xplorer plugs into the PlayStation’s parallel port on the back of the console. Hooking the cartridge up to your PC has several advantages: you can make your own cheat codes by using the freely available X-Link software, grab screen shots and save them as BMP files, transfer game saves between your memory card and your PC, transfer cheats between the cartridge and PC. The X-Flash can be used for repairing broken cartridges. The Professional model includes a device called the X-Assist; a self contained code finding tool.”]
Source: http://www.murraymoffatt.com/playstation-xplorer.php