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An old puzzle.

None.

And a note from Mom.

Doorstop.

It was useful, once.

During the development of Windows, the User Research team tried out an early build of some proposed changes on volunteers from the general community. During one of the tests, they invited the volunteer to just play around with a particular component, to explore it the way they would at home. The usability subject scrolled around a bit, admired t...

Look at all that stuff people bought.

Commenter Neil presumes that Windows 286 and later simply fixed up the movable entry table with jmp selector:offset instructions once and for all. It could have, but it went one step further. Recall that the point of the movable entry table is to provide a fixed location that always refers to a specific function, no matter where that function...

After learning about the bad things that happened if you synchronized your application's input queue with its debugger, commenter kme wonders how debugging worked in 16-bit Windows, since 16-bit Windows didn't have asynchronous input? In 16-bit Windows, all applications shared the same input queue, which means you were permanently in the situation...

Anon is interested in why the FAT driver is called FASTFAT.SYS. "Was there an earlier slower FAT driver? What could you possibly get so wrong with a FAT implementation that it needed to be chucked out?" The old FAT driver probably had a boring name like, um, FAT.SYS. At some point, somebody decided to write a newer, faster one, so they called it ...