<P> IBM PC documentation called Scroll Lock an "inactive key". When PC Magazine asked an executive of keyboard manufacturer Key Tronic about the key's purpose in a 1983 interview, he replied "I don't know, but we put it on ours, too". </P> <P> The indicator light is sometimes used for other purposes such as a keyboard layout indicator in some Linux distributions or other applications, because doing so is less likely to cause problems than manipulating other keys / lights . </P> <P> Keyboard, video, mouse switches (KVM) often use the Scroll Lock key on the keyboard connected to the KVM switch for selecting between computers . On KVM switches with On - screen display (OSD), a "double click" of the Scroll Lock key often brings up the OSD, allowing the user to select the desired computer from a list or access the configuration menu of the KVM . Some models, especially those which lack an OSD, switch to the input corresponding to the number key pressed after Scroll Lock, or in the case of some 2 - port switches, the up and down arrow keys . Simple models with only two or four inputs may immediately switch to the next input following a double press of the Scroll Lock key . </P> <P> Some laptops and keyboards do not have a physical Scroll Lock key . Some of these have a second function on another key that acts as if a Scroll Lock key was pressed . Some common methods are: </P>

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