INT E0 - ConcCP/M,DR Multiuser DOS - "Q_MAKE" - CREATE MESSAGE QUEUE
        CL = 86h
        DS:DX -> queue descriptor (see below)
Return: AX = status
            0000h success
            FFFFh failure
        CX = error code
SeeAlso: INT E0/CL=87h

Format of queue descriptor:
Offset  Size    Description
 00h  2 WORDs   internal use, initialize to zeros
 04h    WORD    flags
 06h  8 BYTEs   queue name
 0Eh    WORD    length of message
 10h    WORD    number of messages
 12h  4 WORDs   internal use, initialize to zeros
 1Ah    WORD    offset in system area of buffer for messages