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AX = 0500h
Return:
AL = status 00h not installed, OK to install 01h not installed, can't install FFh installed BX destroyed (MSCDEX v2.21-2.25) CF clear (MSCDEX v2.21-2.25)
Desc: Determine whether a critical error message override is installed
Note: This set of functions allows a user program to partially or completely override the default critical error handler's message in COMMAND.COM
Category: Shells/Command Interpreters - Int 2Fh - D
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