What if someone threw a rock through your window?
What if someone threw a rock at your window while you were gone would your security system activate? If you have glass break sensors in those areas the answer would be yes.
What if a tree fell over during a store and came through your office window and rain was entering the room would your security system activate? If you have a glass break sensor in your office the answer would be yes. If not you would not be notified.
Often owners will not install Glass Break Sensors but will install motion detectors so if the glass is broken and someone enters the motion will catch them and activate the system.
Break Break or Shock Senors can detector when there is a breach in the glass.
Big trucks sometimes can set off glass break sensors driving by so false alarms can happen depending on the location and your application and the brand and model number of detector.