List of Easter eggs in Microsoft products
Wikimedia list article
Some of Microsoft's early products included hidden Easter Eggs. Microsoft formally stopped including Easter Eggs in its programs as part of its Trustworthy Computing Initiative in 2002.
Windows
Windows 1.0, 2.0 and 2.1 all include an Easter egg, which features a window that shows a list of people who worked on the software along with a "Congrats!" button. Double clicking the list box further changes the background of the window to tiled smiley faces. The instructions for invoking the Easter egg vary depending on the version:
1.xx: Press Alt+⇧ Shift+Esc+↵ Enter.
1.01 and later: Hold Alt then Esc, release Alt then Esc, press Esc twice then press ← Backspace.
2.0 and later: Press F1, F5, F9, F4 and ← Backspace in rapid succession.
Windows 3.0 has a developer credits page which may be accessed by setting the focus to the desktop (by minimizing all windows and clicking on an open area of the desktop) then typing win30 followed by F3 and ← Backspace in quick succession. This causes the developer credits to appear on the desktop in the form of the email names of the crew.
Windows 3.1 has two visible Easter eggs, both of which reference the Microsoft Bear, which was the mascot of the Windows 3.1 development team.
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