<P> Pressing Ctrl + Scroll Lock performs the same function as pressing Ctrl + Break (Pause). This behavior is a remnant of the original IBM PC keyboards, which did not have a dedicated Break (Pause) key . Instead, they assigned the Pause function to Ctrl + Num Lock and the Break function to Ctrl + Scroll Lock . </P> <P> The Scroll Lock key was meant to lock all scrolling techniques, and is a remnant from the original IBM PC keyboard . 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 . </P> <P> Today, this particular use of Scroll Lock is rare . Modern programs honoring this behavior include IBM Lotus Notes, Forté Agent, Image - Line FL Studio, Renoise, Microsoft Excel, LibreOffice Calc, and on occasions Microsoft Word . </P> <P> Some text editors (such as Notepad++, Microsoft Visual Studio) exhibit similar behavior when the arrow keys are used with Ctrl pressed . </P>

What do the lights on the keyboard mean