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INT 2F - Communicating Applications Specification - INSTALLATION CHECK
        AX = CB00h
Return: AL = status
            00h not installed, OK to install
            01h not installed, not OK to install
            FFh installed
Note:   AH = CBh is the default identifier, but may be reconfigured
SeeAlso: AX=8000h"FaxBIOS",AX=CB0Eh,AX=CBDCh
See Also: 2F2A
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