In the 1980s, Games Computers Play (GCP) was an online service written by Gardner Pomper and Greg Hogg and one of the first multiplayer online games (MOGs) to offer a graphical user interface (GUI). The service launched sometime in early 1985, beaten only by a few months by PlayNET on the Commodore 64, which ultimately became America Online.
The system was primarily accessible with Atari 8-bit computers with a minimum of 48k of memory. A version for the Atari ST was also available late in the service's life.[1] The service only garnered about 1,000 subscribers at its peak.