Really well done . This was my first and I ' ll stay tuned <| sep |> Did you just invent an actual use for scrolllock ? No seriously , remapping it via the registry is definitely the way to go , but since the blinkenlight is tied to the function , the new bound key would need to have one as well , right ? Since the only thing scrolllock really does these days is toggle a light and crash uWingAndTail ' s system , it ' s pretty much ideal . I am definitely stealing this idea . Speaking of mild intellectual larceny , I got curious and dug into controlling those lights directly . As usual , it ' s 5 minute easy in Linux , but it looks like AutoHotKey can actually get you there in Windows too , and this g u y k e y b o a r d l e d c o n t r o l c a p s l o cknumlockscrolllocklights has already done the heavy lifting . His script doesn ' t do what you need , but I snagged his functions the big green section and got it working on a toggle pretty easily . Now I ' m gonna see if I can get a blinking email notification light going .