# Installing IVP System Definitions

Before you perform the sample IVP installation steps and tests to verify the IMS Interface installation, first you have to set up the IVP system definitions.

## Procedure

1. Add IMS Interface system definitions to IMS.
   A member with a list of IMS Interface definitions has been supplied, which you must add to your IMS system definitions. Updating these definitions does not force a complete system definition and an IMS restart, with possible interruption for online users. For information on how to perform the updates, see IMS System Definition.

   The following member contains the IMS Interface system definitions:

   Data Set: `USERHLQ.CNTL`

   Member: `SXISYSDF`

   Note: The default message class for transactions, used by IMS Interface, is 13. If this value conflicts, is not unique, or does not adhere to your site standards, modify the definitions in the member.
2. Update the IMS MPP procedure.
   To execute IMS Interface online programs from the Substation ES load library, concatenate the load library to the `STEPLIB DD` Name of the IMS MPP startup procedure.

   Data Set: `USERHLQ.LOAD`

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