DC/UCF Concepts › External User Sessions › DDS Sessions

DDS Sessions

DDS allows DC/UCF systems that are located on different CPUs to communicate with each other. Different access methods can be used for the communication: TCP/IP, VTAM, or CAICCI (Common Communications Interface).

To define the remote DC/UCF systems that will be accessed by another DC/UCF system using DDS, take the following steps:

1. Define the DC/UCF systems and the databases to be accessed using the system generation RESOURCE TABLE and NODE statements.
2. Depending on the access method to use, define the following entities:
   • CCI: define a CCI line
   • TCP/IP: define a DDSTCPIP type PTERM in a SOCKET line
   • VTAM: define a VTAM type PTERM in a DDS line
3. Define a task and program for RHDCNP3S.

You can specify execution characteristics for DDS sessions using the RHDCNP3S task, and you can define additional tasks for specific applications or front-end systems.

Note:

• For more information about defining and maintaining DDS, see the CA IDMS DDS Design and Operations Guide.
• For more information about specifying runtime characteristics of external request units, see the CA IDMS System Operations Guide.

More information:

NODE Statement—Defines a Node

RESOURCE TABLE Statement—Defines a Resource Table

CCI

SOCKET

DDS