Nothing could be more frustrating than waking up one morning only to find that your garage door opener has a problem. No matter how hard you press on the remote control, you find that there is no response at all. If you were going to work, it means you have to use the bus or get into a train. You might be lucky to find that your next door neighbor hasn’t left for work. Even then, he may not be working in the same area of town as you. The most reasonable thing to do here is not to panic.…