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A hinged, sliding, or lifting door to cover an opening in a roof, ceiling, or floor.
An undocumented entry point into a computer program, which is generally inserted by a programmer to allow discreet access to the program.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A door that is flush with the surface; located in a floor, roof, or ceiling, or in the stage of a theater.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
A door set into a floor, ceiling, or roof.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
back doorA secret way to take control of a computer. Also called "trap doors," back doors are built into software by the original programmer, who can gain access to the computer by entering a code locally or remotely. For example, a back door in an application would enable a person to activate either normal or hidden functions within the software. A back door in an operating system would provide access to all system functions in the computer. See encryption backdoor, Easter Egg and Back Orifice.
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