What generation of Windows are you using. It may be slightly different on Windows 7 than Windows 10, for instance.
Also, what is the make/model of your computer and did it come with function keys that were mapped to doing things like muting, increasing/decreasing volume, increasing/decreasing screen brightness, etc. You may be able to exploit those, but you'd have to know which are which for your specific make/model.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
After all, a democracy based solely on the values of the majority, with no overriding ethical principles and processes, is nothing more than clubhouse democracy, great for those on the inside and a tyranny for those who fail to see eye to eye with the majority.
~ Paul Noeldner, May 16, 2007