                                    FCBS
        Specifies the number of file control blocks that may be open
                           See also <CONFIG.SYS>

COMMAND TYPE: System Configuration              VERSION: 3.0 and up

USE: FCBS = n,m

n specifies the number of files that File Control Blocks can open at one
  time. Acceptable range is are 1-255.
m specifies the number files that DOS cannot automatically close.

NOTE: This command must be placed in the <CONFIG.SYS> file and is not a
normal DOS command.

File Control Blocks are an outdated method of handling files.  Most
modern software uses file handles.  This command should only be used
if older applications require it.
