Scroll lock is a rarely used lock key found on PC keyboards. In Microsoft Windows, there is no defined behaviour and the key is vestigial. Some programs such as Microsoft Excel have custom behaviour associated with this key. To paginate command line output in both Windows and Linux, the output must be piped into a paginator command such as more or less, for example:
dir C:\Windows\system32 | more
Acorn MOS does not support a scroll lock key. Instead, paged mode is enabled via control+N; after each page of output, both the caps lock and shift lock lights illuminate, and the system is halted (OSWRCH does not return) until shift is pressed. Control+O releases paged mode. There is no tactile or visual indication that paged mode is engaged. One might imagine that scroll lock would provide a similar behaviour under Windows, but it does not.