Magic-cookie definitions

A small data file passed from one program to another and sent back without change. Typically used in Unix systems, a magic cookie may be an identification token or password that activates a function. The "magic" implies some obscure data known only to the software and not the user. The Web cookie term was coined after magic cookie. See cookie.
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(computing) A token or short packet of data passed between communicating programs, used to identify a particular event or transaction; the data is typically not meaningful to the recipient program and not usually interpreted until the recipient passes the data back to the sender or another program at a later time.
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Origin of magic-cookie

By analogy with fortune cookie.