Basic elements of APPC communications

APPC provides the ability for a user on one system to perform work on another system.

The system from which the request starts is called any of the following: source system, local system, or client.

The system that receives the request is called any of the following: target system, remote system, or server.

From the perspective of a security administrator, the following must happen before a user on one system (SYSTEMA) can perform meaningful work on another system (SYSTEMB):

The source system (SYSTEMA) must provide a path to the target system (SYSTEMB). This path is called an APPC session.
The target system must identify the user and associate the user with a user profile. The target system must support the encryption algorithm of the source system.
The target system must start a job for the user with an appropriate environment (work management values).

The security administrator on the target system has primary responsibility for ensuring that APPC users do not violate security. However, when the security administrators on both systems work together, the job of managing APPC security is much easier.