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        Change number of sessions

        Entry:
          AH = 06h
          DS:DX -> control block (see below)

        Format of control block:

        Offset  Size    Description
         00h 12 BYTEs   reserved
         0Ch    WORD    1500h
         0Eh  6 BYTEs   0
         14h    WORD    (high byte first) primary return code (see AH=02h)
         16h    DWORD   (high byte first) secondary return code (see below, AH=01h)
         1Ah  8 BYTEs   (high byte first) logical unit ID
         22h  8 BYTEs   blanks
         2Ah  8 BYTEs   (high byte first) partner logical unit name
         32h  8 BYTEs   (high byte first) mode name
         3Ah    BYTE    bit 7: use MODE_NAME_SELECT_ALL rather than MODE_NAME
                        bit 6: set negotiable values
         3Bh    BYTE    partner logical unit mode session limit
         3Ch    BYTE    minimum CONWINNERS_SOURCE
         3Dh    BYTE    maximum CONWINNERS_TARGET
         3Eh    BYTE    automatic activation
         3Fh    BYTE    0
         40h    BYTE    bit 7: drain target
                        bit 6: drain source
                        bit 5: target responsible, not source

        Values for secondary return code (see also AH=01h):
                  0000h accepted
                  0001h negotiated
                  0003h bad logical unit ID
                  0004h allocation failure, no retry
                  0005h allocation failure, retry
                  0151h can't raise limits
                  0153h all modes must reset
                  0154h bad SNASVCMG limits
                  0155h minimum greater than total
                  0156h mode closed (prim return code = 1)
                        CNOS mode closed (prim return code = 18h)
                  0157h bad mode name (prim return code = 1)
                        CNOS bad mode name (prim return code = 18h)
                  0159h reset SNA drains
                  015Ah single not SRC response
                  015Bh bad partner logical unit
                  015Ch exceeds maximum allowed
                  015Dh change SRC drains
                  015Eh logical unit detached
                  015Fh CNOS command race reject