Type: Internal (3.1 and later)
Purpose: Used in the CONFIG.SYS file to specify the number of file-control blocks (FCBs) for file sharing.
You should only include an FCBs in your CONFIG.SYS if the program you are using
requires it. Most newer programs do not use FCBs.
number - Specifies the maximum number (1 to 255) of open FCBs that a program can
use. The default is 4.