UEPL - User Exit Program Link

      CONTROL BLOCK NAME = DFHUEPLC
                                                 (progeny of DFHUEPLC)
      DESCRIPTIVE NAME = CICS TS (UE) User Exit Program Link DSECT
             Licensed Materials - Property of IBM
              Restricted Materials of IBM 
             5655-Y04
             (C) Copyright IBM Corp. 1992, 1998 
      FUNCTION = Copybook for EPL DSECT.
          The EPLs are used by User Exits to link User Exit Blocks
          (EPBs) together. There is one EPB per enabled program, and
          the EPBs are shared by the exit points that have had the
          program enabled.
          For a particular exit, when the first program is enabled for
          the exit, an EPB is created (or reused if one already exists
          for another exit). The address of the first EPB is stored in
          the User Exit Table Entry (UETE) for that exit point.
          For every subsequent program enabled at the same exit point,
          an EPL will be created. This EPL chain is also chained off
          the UETE. The EPLs simply link to EPBs for all the programs
          enabled for an exit point.
      NOTES :
       DEPENDENCIES = S/370
       RESTRICTIONS = None
       MODULE TYPE = Control block definition
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