The+Scroll+Lock+key

The Scroll Lock key

The Scroll Lock key is a left-over from back in the day, where the user would need to modify the behaviour of the arrow keys so they could just scroll the contents of a text window instead of moving the cursor

Some programs, like MS Excel and Lotus Notes, still make use of the Scroll Lock, but outside of that, and perhaps a few other program-specific functions, it’s rarely used anymore. Some keyboards, like those manufactured by Apple, in fact most keyboards do not even have a Scroll Lock key on them  