INT 92 - Da Vinci eMail Dispatcher - "NetRemoveName"
        AX = E10Eh
        BX = 0004h
        CX:DX -> parameter block (see below)
Return: AX = 0001h
Note:   this function is used to remove a username

Format of parameter block:
Offset  Type    Description
 00h    WORD    segment of uppercase username
 02h    WORD    offset of uppercase username
 04h    WORD    segment of "DVSEMAIL"
 06h    WORD    offset of "DVSEMAIL"