INT 21 U - Novell NetWare - VERIFY NETWORK SERIAL NUMBER
        AH = E3h subfn 0Ch
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
Note:   if the network serial number to be verified is correct, the reply
          buffer will contain the corresponding application number
SeeAlso: AH=E3h/SF=12h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0005h (length of following data)
 02h    BYTE    0Ch (subfunction "Verify Network Serial Number")
 03h    DWORD   (big-endian) network serial number to verify

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 0002h (size of following results buffer)
 02h    WORD    (big-endian) application number

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