INT 92 - Da Vinci eMail Dispatcher INTERFACE
        AH = E1h
        AL = function
        BX = stack count (number of words to push)
        CX:DX -> stack data (in word-reversed order ready to push)
Return: AX = status
            0001h success
            FF97h "ERS_NOT_AVAILABLE"
            FF99h "ERS_TOO_MANY_NAMES"
            FF9Ah "ERS_BAD_NAME_PASSWORD"
            FFE3h "ERS_NAME_NOT_FOUND"
            FFF8h "ERS_USE_STRING" (call NetGetError to get error string)
            FFFFh "ERS_NO_SUCH_FILE"
Note:   preserves BP, DS, SI, DI; other registers may be destroyed