It references "The TELNET Song" by Guy L. Steele (a.k.a The Great Quux). The original is about Telnet, and given the subject of discussion, the reference seemed a natural one to make.

I am not sure, but it looks vaguely familiar. There is a text-based game called adventure game called Dunnet where you come across a CPU card, and do some stuff with it later on. As far as I remember, the game predates SSH, so the game either had Telnet or FTP. My memory fades.