Even in ancient, pre-Mac times, software usually had credits buried in it somewhere. With the advent of graphical user interfaces in the mid-1980s, the About Box became the standard place for credits. The About Box was easily accessible to users and was always found in the same place. This box was in the original Finder and was one of the first About Boxes many Mac users ever saw:
Through the 1980s, most companies were OK with this practice. Apple was schizophrenic, keeping some teams from announcing themselves while encouraging others to sign their work. The original Mac team literally signed the case mold, ensuring their names would appear on the inside of every Mac produced.
As technology progressed, About Boxes got fancier. One version of MultiFinder for Mac got out the door with this epic About Box:
|Click the images for big-enough-to-read versions|
The folks who made the Macintosh SE managed to hide photos of themselves in ROM.
Soon the Secret About Box (which is a particular form of Easter egg) was well-established. The Secret About Box technique was useful for 2 reasons:
1. It lent an air of mystery to About Boxes because you had to know how to invoke them.
2. Teams could semi-plausibly hide About Boxes from management because they weren't obviously visible.
One of the best-known Secret About Boxes shipped with System 7.5.3. After following the secret instructions, which involved typing the phrase Secret About Box and dropping it in a certain place, you got a cool picture of a fake flag waving over Apple's real campus.
Windows XP had a credits screen that was Internet-based. (I forget exactly how it worked and can't Bing the answer. Maybe one of my old Microsoft pals remembers?) Because many Windows customers, especially governments, don't like hidden surprises in their software, Microsoft fully disclosed how to find this About Box and what it contained. Not much adventure in that approach.
Some software, like Hypercard 2.0 and BBEdit, puts the user's own name into their About Boxes. That's very nice of them.
About Boxes and the inside of a computer case are not the only places to sign your work. Sometimes companies publish books about how awesome they are, like Apple and Microsoft have done. In those books they sometimes like to do crazy things like list every employee they ever had, in teeny tiny type (much enlarged here):
|From Inside Out: Microsoft In Our Own Words|
|From So Far: The First 10 Years of a Vision (Apple)|
There are zillions of examples of great About Boxes. If you have any favorites, please bring them up in the comments.