The two were together on the cover of Fortune Magazine in August 1991, as seen here in a copy on display in the Microsoft Visitor Center museum.

Gates and Jobs were the central figures in the 1999 film Pirates of Silicon Valley, starring Noah Wyle as Jobs (left) and Anthony Michael Hall as Gates.

Here's a shot from the film of the two characters together. Given how rare joint appearances of the real Gates and Jobs have been, we figured we'd include this on-screen meeting.

In this scene from Pirates of Silicon Valley, the ersatz Gates scowls at Jobs. Shortly after the movie's premiere, the introductory remarks at the 1999 Macworld conference were made by Wyle, in a reprise of his movie role. The real Jobs then appeared and wowed the crowd with the wireless iBook.

Jobs and Gates have appeared at The Wall Street Journal's past "D" conferences. Here they are laughing it up over the main course at a D dinner in 2005.

At the same dinner in 2005, Jobs and Gates talk with Journal columnist Walt Mossberg, who hosts the annual conference with Kara Swisher.

Things weren't so jovial in this February 2007 encounter between Gates and Jobs in the SuperNews section of Current TV, a Web site dedicated to having fun in cartoon form. The video from which this image comes is in part a spoof of the ongoing Mac-versus-PC ads that have become a staple of TV and the Web.

In the Current TV cartoon, the Jobs character taunts his counterpart in the spirit of the Mac-versus-PC ads: "I'm cool and you're a pathetic old man." Gates later ripostes by reminding Jobs that Windows now runs on Apple computers.

A high point of the Current TV cartoon is a Star Wars-inspired duel between the computer industry icons. When Gates pulls out "my new Zune saber," Jobs counters with an iPhone-powered light saber.