Pro Key Lock - Version 2.3 Pro Key Lock allows the user to lock specific keyboard and mouse buttons. You can use Pro Key Lock to lock specific keys like the function keys, the caps-lock key, the windows (start) key or key combinations like Alt-Tab, etc. You can also lock specific mouse functions like the right click or the double click. The user can also define a rectangle on the screen and instruct Pro Key Lock to enable mouse clicks only inside/outside this rectangle.