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2. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

3. Rolling code - Wikipedia

   en.wikipedia.org/wiki/Rolling_code

   Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.

4. Remote keyless system - Wikipedia

   en.wikipedia.org/wiki/Remote_keyless_system

   A security concern with any remote entry system is a spoofing technique called a replay attack, in which a thief records the signal sent by the key fob using a specialized receiver called a code grabber, and later replays it to open the door. To prevent this, the key fob does not use the same unlock code each time but a rolling code system; it ...

5. Can an aftermarket key fob be programmed by anyone ... - AOL

   www.aol.com/aftermarket-key-fob-programmed...

   I want to get a second key fob for my car, but the dealer quoted me a price of $400. Are there any cheaper alternatives?

6. Chamberlain Group - Wikipedia

   en.wikipedia.org/wiki/Chamberlain_Group

   Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards. The greatest difference between the brands is that Chamberlain and Craftsman operate on a square shaped split-rail system, while LiftMaster consists of one single solid piece of inverted ...

7. Door breaching - Wikipedia

   en.wikipedia.org/wiki/Door_breaching

   A U.S. Marine performs a ballistic breach of a padlocked door using a combat shotgun. Door breaching is a process used by military, police, or emergency services to force open closed or locked doors. A wide range of methods are available depending on the door's opening direction (inward or outward), construction materials, etc., and one or more ...