This is a very simple app to test phone keys and switch sensors. It will simply show what key you have pressed, in addition to the system name for the key and the Java key code for it. It can be very useful to identify broken or "stuck" keys in your cellphone.
It actually helped me to identify a short-circuited key on my cell phone, so while I initially regarded this utility completely useless for anyone else, I eventually decided to release it to the public it under the utterly stupid name KeyInfo