RAB

   The record access block (RAB) defines run-time options for a
   record stream and for individual operations within a predefined
   record stream context. After you connect the file to a record
   stream and associate the record stream with a FAB, you use the
   RAB fields to specify the next record you want to access and to
   identify appropriate record characteristics.

   NOTE: If you are using 64-bit addressing on an OpenVMS Alpha
   system, you must use RAB64 instead of RAB.

   The following table lists the symbolic offset, the size in bytes,
   the FDL equivalent and a brief description of each field.

   Offset      Size   FDL Equivalent           Description

   RAB$B_BID   1      None                     Block identifier
   RAB$L_BKT   4      CONNECT BUCKET_CODE      Bucket code
   RAB$B_BLN   1      None                     Block length
   RAB$L_CTX   4      CONNECT CONTEXT          User context
   RAB$L_FAB   4      None                     File access block
                                               address
   RAB$W_ISI   2      None                     Internal stream
                                               identifier
   RAB$L_KBF   4      None                     Key buffer address
   RAB$B_KRF   1      CONNECT KEY_OF_          Key of reference
                      REFERENCE
   RAB$B_KSZ   1      None                     Key size
   RAB$B_MBC   1      CONNECT MULTIBLOCK_      Multiblock count
                      COUNT
   RAB$B_MBF   1      CONNECT MULTIBUFFER_     Multibuffer count
                      COUNT
   RAB$L_PBF   4      None                     Prompt buffer address
   RAB$B_PSZ   1      None                     Prompt buffer size
   RAB$B_RAC   1      CONNECT                  Record access mode
   RAB$L_RBF   4      None                     Record buffer address
   RAB$W_RFA   6      None                     Record file address
   RAB$L_RHB   4      None                     Record header buffer
                                               address
   RAB$L_ROP   4      CONNECT                  Record-processing
                                               options
   RAB$W_RSZ   2      None                     Record size
   RAB$L_STS   4      None                     Completion status
                                               code
   RAB$L_STV   4      None                     Status value
   RAB$W_STV0  2      None                     Low-order word status
                                               value
   RAB$W_STV2  2      None                     High-order word
                                               status value
   RAB$B_TMO   1      CONNECT TIMEOUT_PERIOD   Timeout period
   RAB$L_UBF   4      None                     User record buffer
                                               address
   RAB$W_USZ   2      None                     User record buffer
                                               size
   RAB$L_XAB   4      None                     Next XAB address