| 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 and later Fossil32 were common door systems.
Popular door games included:
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