*COMDECK IMSNCNB
 #
*0DC  NCNB
* 
*     INTERACTIVE VIRTUAL TERMINAL (IVT) NETWORK CONNECTION 
*     BLOCK. ONE FOR EACH IVT CONNECTION. IT IS CREATED WHEN
*     THE HOST OR NETWORK INITIATES A NEW CONNECTION OR 
*     WHEN A PRU CONNECTION IS SWITCHED TO ANOTHER APPLICATION
*     AND RELEASED WHEN THE CONNECTION IS TERMINATED
*     OR SWITCHED TO A PRU CONNECTION.
*     IS DYNAMICALLY ALLOCATED AND CAN BE MOVED BY GARBAGE
*     COLLECTION. 
* 
* 
*                        1    2  2  3  3  3  3   3   3    3  4  4   5   5 
*      0     6 8         6    4  7  0  1  2  3   4   6    9  2  4   2   9 
*     I-----I----------------I--I--I--I--I--I--I----I----I----I----I----I 
*     I     I                IN IP I  IH IN IA I    I    I    I    I    I 
*     I  ID I       SIZE     IB IR I  IR IR IA I // I DT I TC I PW I PL I 
*     I     I                IL II I  I  I  I  I    I    I    I    I    I 
*     I-----I----------------I--I--I--I--I--I--I----I----I----I----I----I 
*     I  TN   I   HN    I CN I            ABN               I    ACKQP
*     I-------I---------I----I------------------------------I-----------I 
*     IA I AI           I                                   I           I 
*     IC I CI           I                                   I           I 
*     IK I KI    BLKSQ  I               DRBP                I    DRFP   I 
*     II I OI           I                                   I           I 
*     IN I UI           I                                   I           I 
*     I  I TI           I                                   I           I 
*     I--I--I-----------I-----------------------------------I-----------I 
*     I I N I                I                              I           I 
*     I I B I                I                              I           I 
*     I I T I      ACNB      I            TOTBLK            I    TOTCH  I 
*     I I E I                I                              I           I 
*     I-I---I----------------I------------------------------I-----------I 
*     I                       TNAME                         I   NCNT AD I 
*     I-----------------------------------------------------I-----------I 
* 
* 
*     WHERE 
* 
*     ID       = NETWORK CONNECTION BLOCK ID
*     SIZE     = BLOCK SIZE 
*     PRI      = CONNECTION PRIORITY
*     NBL      = NETWORK BLOCK LIMIT
*     HR       = HOST REGULATION FLAG, SET IF NIP HAS PUT 
*                CONNECTION IN REGULATION 
*     NR       = NPU REGULATION FLAG, SET IF NPU HAS PUT
*                CONNECTION IN REGULATION 
*     AA       = APPLICATION TO APPLICATION FLAG
*     DT       = TERMINAL DEVICE TYPE 
*     TC       = TERMINAL CLASS, ZERO FOR AA CONNECTION 
*     PW       = PAGE WIDTH OF TERMINAL DEVICE, ZERO FOR AA CONNECTION
*     PL       = PAGE LENGTH OF CONSOLE DEVICE, ZERO FOR AA CONNECTION
*     HN       = COUPLER NODE NUMBER
*     TN       = TERMINAL NODE NUMBER 
*     CN       = NETWORK CONNECTION NUMBER
*     ABN      = ABN OF LAST DATA BLOCK SENT DOWNLINE ON THIS 
*                CONNECTION FOR WHICH A BACK HAS BEEN RECEIVED
*     ACKQP    = ACKNOWLEDGE QUEUE TABLE
*     NBL      = NETWORK BLOCK LIMIT
*     BLKSQ    = NUMBER OF NETWORK BLOCKS QUEUED TO BE SENT DOWNLINE
*                ON THIS CONNECTION 
*     DRBP/    = ALL NETWORK BLOCKS WHICH CANNOT BE SENT DOWNLINE 
*     DRFP       (BECAUSE NBL HAS BEEN REACHED OR THE CONNECTION
*                IS IN REGULATION) ARE LINKED WITH THE NCNB IN A
*                DOUBLE LINKED CHAIN. IF NO BLOCKS ARE QUEUED, THE
*                POINTERS ARE ZEROED. 
*     NBTE     = NBT ENTRY INDEX
*     ACNB     = ADDRESS OF THE CORRESPONDING ACNB. ZERO IF THE 
*                CORRESPONDING ACNB HAS BEEN DELINKED 
*     TOTBLK   = TOTAL NUMBER OF DATA BLOCKS SENT DOWNLINE
*                ON THIS CONNECTION, USED ONLY IF STAT OPTION 
*                IS DEFINED DURING BUILT. 
*     TOTCH    = TOTAL NUMBER OF CHARACTERS SENT DOWNLINE ON
*                THIS CONNECTION, USED ONLY IF STAT IS DEFINED
*                DURING BUILT.
*     AA       = APPLICATION TO APPLICATION CONNECTION FLAG 
*     TNAME    = TERMINAL NAME IF A-T CONNECTION, 
*                APPLICATION NAME IF AA CONNECTION
*     NCNT AD  = ADDRESS OF NETWORK CONNECTION NUMBER TABLE 
*                ASSOCIATED WITH THIS CONNECTION
* 
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