The Scroll Lock key was meant to lock all scrolling techniques, and is a remnant from the original IBM PC keyboard, though it is not used by most modern-day software. In the original design, Scroll Lock was intended to modify the behavior of the arrow keys. When the Scroll Lock mode was on, the arrow keys would scroll the contents of a text window instead of moving the cursor. In this usage, Scroll Lock is a toggling lock key like Num Lock or Caps Lock, which have a state that persists after the key is released.

But I also remember downloading stuff from the usenet alt.binaries.pictures.erotica.* newsgroups and needing to edit out the headers, cat them together, and then run the whole thing through uudecode. Good times -- that's partly how I learned vi. ;-)

Another case that I'm aware of involved an agreement that a couple made with them years ago, and the IRS recently came back and said, "the agent who made that agreement didn't have the authority to do it.