Scroll Lock was reportedly specifically added for spreadsheets, and it solved a very specific problem: before mice and trackpads, and before fast graphic cards, moving through a spreadsheet was a nightmare. Just like Caps Lock flipped the meaning of letter keys, and Num Lock that of the numeric keypad keys, Scroll Lock attempted to fix scrolling by changing the nature of the arrow keys.
Here, the 0 in the (catch $v 0) refers to the function call itself:
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МИД Ирана заявил о «начале конца» ООН20:48，更多细节参见超级权重
Massive worldwide economic harm, no real consequences.