INT 92 - Da Vinci eMail Dispatcher - "NetCheckQueue"
        AX = E10Bh
        BX = 0004h
        CX:DX -> parameter block (see below)
Return: AX = 0001h
SeeAlso: AX=E10Ch

Format of parameter block:
Offset  Size    Description
 00h    WORD    segment of 24 byte username buffer
 02h    WORD    offset of 24 byte username buffer
 04h    WORD    segment of 24 byte protocol buffer
 06h    WORD    offset of 24 byte protocol buffer