This is useful for debugging scenarios where you have the program paused and are attempting to use an external keyboard. The virtual keyboard adds a low level keyboard hook to account for special keys being toggled. The issue is that when the program is paused, Windows waits, until a short timeout, for hooks to finish executing. Since the program is paused, the virtual keyboard hook never executes, thus every keystroke has a few hundred millisecond or so delay before it actually takes affect. This pretty much makes doing anything on the keyboard while the program is paused impossible.