A door is a computer program, on a bulletin board system, that runs outside of the main bulletin board program. Sometimes called external programs, doors are the most common way to add games, utilities, and other extensions to BBSes. From the 1990s on, most BBS software had the capability to "drop to" doors. Several standards were developed for passing connection and user information to doors; this was usually done with dropfiles.

Most doors were responsible for operating the serial port or other communications device directly until returning control to the BBS. Later development of FOSSIL drivers have allowed both BBSes and their doors to communicate without being responsible for direct operation of the communications hardware.

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bulletin board system
Most popular in the 1980s and early 1990s before the overwhelming popularity of the internet, Bulletin Board Systems (BBSes) are computers that can be ...

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The Simpsons/Butterfinger commercials
Season Two (1990-1991) Commercials Dad Says No Teasing! (Butterfinger) Bart: Behold, the last Butterfinger in the whole house, and I have it! Lisa: Dad says no teasing!

Russian proverbs
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Games: Video Games: Roleplaying: Browser Based
See also: Games: Video Games: Browser Based (252) This category in other languages: Chinese Simplified (13) German (29) Polish (17) Russian (52) Turkish (7)

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Games: Online: BBS Doors: Legend of the Red Dragon
GameFAQs - Overview, tips, and frequently asked questions about the game. Gameport - Description of the game, and online sales.

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Games: Online: BBS Doors: Trade Wars Series ...
Epic Interactive Strategy - The official support site of the Trade Wars: 2002 Game Server, Door, and Gold versions. Kozak's Tradewars ...