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2. Pet door - Wikipedia

   en.wikipedia.org/wiki/Pet_door

   A dog exiting through a pet door. A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human to open the door. Originally simple holes, the modern form is a ...

3. Sliding glass door - Wikipedia

   en.wikipedia.org/wiki/Sliding_glass_door

   Another design, a wall-sized glass pocket door has one or more panels movable and sliding into wall pockets, completely disappearing for a 'wide open' indoor-outdoor room experience. The sliding glass door was introduced as a significant element of pre-war International style architecture in Europe and North America.

4. Perimeter intrusion detection - Wikipedia

   en.wikipedia.org/wiki/Perimeter_intrusion_detection

   A fence-mounted perimeter intrusion detection system installed on a chain link fence. A perimeter intrusion detection system (PIDS) is a device or sensor that detects the presence of an intruder attempting to breach the physical perimeter of a property, building, or other secured area.