In the world of gaming, Mr. Carmack's influence has been enormous. His team created the original first-person shooter game, Wolfenstein 3-D, in 1992. It legitimized the shareware movement, starting in 1993 with progressive releases of the Doom franchise, which generated more than $100 million in revenue (even though roughly 15 million copies of the original were downloaded for free). Presaging Internet business models, Id gave away a lot of stuff for free, hooking game addicts and then selling them upgrades. In 1996, Id created the first true 3D game, Quake, and since then the company has played a key role in the development of multiplayer Internet games. ...