Simplify the following text for a Grade 7 native English-speaking person.
Original: 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 .
Simplified: The scroll lock is a computer key that was meant to lock all scrolling techniques . The scroll lock key is rarely used and is a remnant of the original IBM PC keyboard .