MCP [Spoiler alert for a 40 year old movie]
When we see the MCP die at the end it's a very old guy using a typewriter. Seeing that all the programs show their users was the MCP just a chess program written on punch cards?
Dumont stated that a chess program was the humble beginnings of the MCP.
Also, Dumont named his program Dumont. He is the only user called out by the programs by name in the system.