Specifies the number of file control blocks (FCBs) that MS-DOS can have open
at the same time. You can use this command only in your CONFIG.SYS file.
A file control block is a data structure that stores information about a
Specifies the number of file control blocks that MS-DOS can have open at
one time. Valid values for x are in the range 1 through 255. The default
value is 4.