Of course, now I'm wondering if there is more to the "scroll lock" or "pause/break" keys than meet the eye.

In those applications that support it, the scroll lock key locks the cursor where it is, moving the whole document around. That means that with scroll lock enabled, you control the scrolling of a document and not the movement of the cursor with the cursor keys. Under most Unix dialects, Scroll Lock is halting all text output of an application and resumes output again. Unless the application is requesting input, it is still running in the background usually, its output just doesn't get displayed.

As for the Pause/Break key, those are only meaningful in commandline applications. Pause pauses the running application and resumes it again, Break is almost the same as sending CTRL-C. Don't ask me if pressing the key without shift/ctrl/alt is sending Pause or Break, and don't ask me which key combination is sending the other one either. I don't remember that.

cu,
sven