Scroll Lock
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Scroll Lock or ScrLk is a lock key on most IBM-compatible computer keyboards. Depending on the operating system, it may be used for different purposes, and applications may assign functions to the key
The scroll-lock key with an activated indicator light on an IBM Model M keyboard
Break key
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The Break key of a computer keyboard refers to breaking a telegraph circuit and originated with 19th century practice. In modern usage, the key has no well-defined purpose and can be used by software
Scroll Lock
…performs the same function as pressing Ctrl+Pause/Break. This behavior is a remnant of the original IBM PC keyboards, which did not have a dedicated Pause/Break key. Instead, they assigned the Pause function to Ctrl+Num Lock and the Break function to Ctrl+Scroll Lock. The Scroll Lock key is meant to lock all…
Break key on Teletype Model 33