Scroll lock pisses me off ...
We use lotus notes at work, if I accidently hit the scroll lock key, it makes the entire window scroll around with arrows instead of the location of the cursor.
It also sorta does the same thing in Excel.
IIRC, it also works like Pause used to for Dos when dealing with Linux consoles with AT/PS2 keyboards (I assume USB as well, but I have never used a USB keyboard)
Been using computers since 1984, I started with PCs around 1991 or so, with a 486 DX33.