When DOS boots up, it looks in the root directory of the boot disk for a text file named CONFIG.SYS. If that file exists, it is read and processed as a list of configuration commands. Command Function Command Function BREAK= Ctrl-Break test level █ INSTALLHIGH= load TSRs into UMB BUFFERS= # of disk I/O buffers █ MENUITEM= menu text & action COUNTRY= country-dependant info █ MENUCOLOR= menu colors cmd?= conditional execution █ MENUDEFAULT= default and time-out DEVICE= install device driver █ NUMLOCK= state of NumLock DEVICEHIGH= install driver in UMB █ REM or ; comments in CONFIG.SYS DRIVPARM= parms for disk drivers █ SET e-vars in CONFIG.SYS FCBS= max open FCBs █ SHELL= install cmd processor LASTDRIVE= SUBST drive ID limit █ STACKS= hdwr int stack sizes FILES= max # of file handles █ SUBMENU= set up a submenu INCLUDE= run cmds in a block █ SWITCHAR= cmd-line switch char INSTALL= load TSRs █ SWITCHES= kydb, boot opts, etc. CONFIG.SYS is a standard text file▲, created by any text editor. Changes to CONFIG.SYS take effect only after you restart DOS. See Also: Enhanced CONFIG.SYS Options MultiConfig Menus Device Drivers System Startup Sequence -♦-