5. OPERATION › 5.1 Operation Overview › 5.1.6 VCC User Exits

5.1.6 VCC User Exits

At specific points within its processing flow, VCC allows for
optional user written exit routines to receive control in
order to add additional information, modify existing data in
the output records, or in some way alter VCC's normal logic
flow.

Samples of the user exits are distributed for your
convenience.  They illustrate coding techniques, register and
linkage conventions, and entry and exit logic. These exits
have been tested and work successfully. They are not however,
certified in the same sense as the rest of VCC and you should
carefully review the code in your own environment.

The following sections describe the various exit points
provided by VCC:

     1 - VTOC DSCB Exit (VCCUEXIT)
     2 - DFHSM User Exit (VCCUHSMX)
     3 - HFS User exit  (VCCUSERX)