10 points (well, an upvote, I guess) for anyone who knows why the Windows DOS-mode installer says "Press F3 to exit"
When I first saw that UI in 1990 or so, I was so confused how one program could accidentally cause another one not to respond. And how all the filenames had to be in 8.3 format.
Amiga had spoiled me.
Press F3 to exit setup without rebooting; A bug in the MS-Client installer prevents a file necessary for Windows 3.1x support from being installed. This isn't necessary if running solely under DOS, but it doesn't hurt in anyway, so let's install it just to be safe.
Warning: [Omitted] source link is blocked as malware by Firefox, quote gleaned from [DDG] search results.
On the other hand there is a related issue: on DEC (and some other) terminals with LK201-style keyboards (which in turn inspired the "modern" PC/AT keyboard layout with F1-F12) the keys in positions of F1-F5 had fixed functions. This is the reason why there are about four different escape sequences across vt220-compatible terminal emulators for F5. There simply was not any DEC terminal that had F5 on its keyboard (F1-F4 are almost always mapped to PF1-PF4).