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 NCB_COMMAND   NCB Command field                       (  1 byte)
 NCB_RETCODE   NCB Return code field                   (  1 byte)
 NCB_LSN       NCB Local Session number field          (  1 byte)
 NCB_NUM       NCB number assigned to your name        (16 bytes)
 NCB_BUFFER@   NCB pointer to message buffer address   ( 4 bytes)
 NCB_LENGTH    NCB buffer length                       ( 2 bytes)
 NCB_CALLNAME  NCB name on local or remote adapter     (16 bytes)
 NCB_NAME      NCB name on local adapter               (16 bytes)
 NCB_RTO       NCB session receive time-out value      (  1 byte)
 NCB_STO       NCB session send time-out value         (  1 byte)
 NCB_POST@     NCB pointer to POST routine             ( 4 bytes)
 NCB_LANA_NUM  NCB adapter selection                   (  1 byte)
 NCB_CMD_CPLT  NCB Command Complete Status field       (  1 byte)
 NCB_RESERVE   NCB reserved area                       (14 bytes)

 NCB offset table