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How do I write a batch file that exits when ESC is pressed, and continues when any key is pressed?

The following is quoted from wphs0326 on 2004-3-23 0:03:59:
How do I write a batch file that exits when ESC is pressed, and continues when any key is pressed?

@echo off
ECHO Please choose A. Continue executing this batch file ESC. Exit this batch file
INKEY 99 A98 a97
IF ERRORLEVEL 99 GOTO END
IF ERRORLEVEL 98 GOTO GO

:GO
ECHO Continue executing the program
GOTO OK

:END
ECHO Exit the program

:OK

The INKEY.COM file used by the program and the batch file example:
Open attachment

Thanks!!