誰可以解釋壹下這段內容有什麽作用

@ECHO OFF

PROMPT $P$G

SET DIRCMD=/4

MODE CON RATE=32 DELAY=1

REM MODE CON CP PREPARE=((437)EGA.CPI)

REM MODE CON CP SELECT=437

REM KEYB US,,KEYBOARD.SYS

LH KILLER

LH DOSKEY

LH DOSLFN /Z:c:\msdos71\CP437UNI.TBL

LH MSCDEX /D:IDE-CD

LH SHARE

REM LH NLSFUNC

REM LH SMARTDRV

LH CTMOUSE

REM For compatiblity purpose:

LH CTMOUSE > NUL

ECHO.

REM For locking volumes to enable "direct disk access":

CALL LOCKDRV

BREAK ON

LFNFOR ON

ECHO Now you are in MS-DOS 7.10 prompt. Type 'HELP' for help.

ECHO.