File control block
<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
FCBS=x,y
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.
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