There is a door. It could be to a business, it could be to a home, it could be to a funeral home. For my purpose here, it actually is to a funeral home. I don't figure they would even have a security system, but concentrate on The Door rather than where it is.
How do you know if you can open this door without an alarm going off?
Firstly, you would check to see if there's a sticker on the door, right, promoting some security company?
Suppose there is: how do you open The Door without it going off?
Suppose there isn't: how can you tell if there is an alarm?
Also: Does anyone happen to know a lot about security systems? Enough to know what the most common ones are?