It used to be for holding the display on screens.....stuff in DOS which extended for more than one screen would simply fly past. You could hit scroll lock and it would stop....or at least, that's what I remember doing.
It was so you could limit the amount of info that DOS would display on one command. And then you'd have to press a key to make it continue...the buffer was only so big, so if stuff just flew by you'd miss it and you wouldn't be able to find it again because it got deleted in the buffer.
Scroll Lock is used like this.
You do a type filename.foo
Hit scroll Lock
use Up and down to look at it
you can use it with other commands like dir and what not, yea yea, i know, why not just pipe it to more, well, they didn't have that option in DOS 2.x, yes, i used that with my IBM PCjr when i was like 7.
Nowadays you can still use it in Excel to scroll around the spreadsheet using the arrow keys, while holding the cursor in the active cell. Normally when you hit an arrow key, not only would the spreadsheet scroll, but it would also change which cell you are working on. Scroll lock changes this behaviour to just scroll around the spreadsheet.
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