Scroll Lock and Other Keyboard Mysteries

Though 90% of the keys on my keyboard are subject to everyday use, some keys are never touched (and, quite frankly, they scare me a little). The Straight Dope unlocks the mystery of Scroll Lock and other strange, leftover keys that reside on our grubby expanded keyboards.

[I'm glad to discover that these sacred keys are not harmful. In my heart of hearts, I'd always suspected that the Sys Rq key was the reason that my keyboard bore the ominous "Warning: Some experts believe that the use of any keyboard may cause serious injury."]