I've written a simplel VI that increases or decreases a numerical indicator depending on which key is pressed on the keyboard. But this only works when the VI window is active (the titlebar is blue and not gray). Is there anyway to listen for the key-down event even though the VI is not active?
Since the key down event is for the VI itself, I don't think so. You could however, use the Acquire Input Data function on the Input Device Control palette. I ran a quick test and it seemed to detect all key presses whether the window had focus or not.