Transfer msg data

        Entry:
          AH = 05h
          DS:DX -> control block (see below)

        Format of control block:

        Offset  Size    Description
         00h 12 BYTEs   reserved
         0Ch    WORD    1C00h
         0Eh    BYTE    00h user defined
                        01h NMVT
                        02h alert subvectors
                        03h PDSTATS subvectors
         0Fh  5 BYTEs   0
         14h    DWORD   (high byte first) return code (see AH=01h)
         18h 12 BYTEs   0
         24h    BYTE    if bit 0 clear, add correlation subvector
                        if bit 1 clear, add product set ID subvector
                        if bit 2 clear, do SYSLOG
                        if bit 3 clear, send SSCP_PU_SESSION
         25h    BYTE    0
         26h    WORD    length of data
         28h  N BYTEs   data