Used to like working on DOS. Many of the apps on it were very fast to use, as others have said. And TSRs (Terminate and Stay Resident programs) [1] were fun to

Used to like working on DOS. Many of the apps on it were very fast to use, as others have said. And TSRs (Terminate and Stay Resident programs) [1] were fun to use. I particularly liked Borland Sidekick (a multi-utility tool that could be popped up via a hot-key on top of whatever program you were running). [2] Sidekick sold tons of copies, I read. Edit: According to the Wikipedia article below, "Sidekick sold more than 1 million copies in its first three years". [1] https://en.wikipedia.org/wiki/Terminate_and_stay_resident_program https://en.wikipedia.org/wiki/Terminate_and_stay_resident_pr... [2] https://en.wikipedia.org/wiki/Borland_Sidekick https://en.wikipedia.org/wiki/Borland_Sidekick