A BBS door was a mechanism to execute and communicate with an external program, commonly a game on bulletin board systems (commonly referred to as door games). The BBS software would start the external program, and the door system would pass data back and forth between the door program, the BBS, and the remote user. To supply the door program with the user's information (such as the user's alias and the amount of time they had spent online), the BBS software would create a drop file containing information for the program to read. FOSSIL was a popular communications hardware/software interface standard used by MS-DOS compatible BBS software and door programs which has helped these legacy programs remain compatible with modern communications technologies such as Telnet and Rlogin.
While many of the most popular and memorable BBS doors were games, numerous doors had non-entertainment applications such as user polls or the time bank, permitting users to time-shift their rationed BBS use. Frequently they would act as a front-end to themed databases on subject such as astrology, numerology and fortune-telling, recipes, weather prediction, personal ads (sometimes with additional match-making functionality), classified ads and "for sale" listings (sometimes permitting auctions), BBS lists and parting comments from the most recent BBS callers.
Popular door games included:
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Software :: Bulletin Board Systems

Anthro-Morphs.com - Home of the Medieval Warfare online game.
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Battle of The Arts and Primal Chaos - Support site for the door games Battle of The Arts and Primal Chaos.
Meta Description: [ Support site for the door games Battle of The Arts & Primal Chaos ]
CompuLink BBS Door Programs - Collection of doors, primarily games, available for download.
John Dailey Software - Developer of BBS Door games such as Barren Realms Elite, Dungeon Master, and Global Backgammon. Offers Bulletin Board System utilities, game information, and online ordering.
Meta Description: [ John Dailey Software is a long-time provider of incredible shareware focused primarily on BBS on-line development. ]
Planets: The Exploration of Space Fansite - Includes planet, ship, trading, item, and secrets guides, forums, and BBS list.
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