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Computing (FOLDOC) dictionary
file control block
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operating system (FCB) An MS-DOS data structure that
stores information about an open file. The number of FCBs is
configured in CONFIG.SYS with a command
where x (between 1 and 255 inclusive, default 4) specifies the
number of file control blocks to allocate and therefore the
number of files that MS-DOS can have open at one time. y (not
needed from DOS 5.0 onward) specifies the number of files to
be closed automatically if all x are in use.