To use reference pattern services, you issue CALLs that invoke the appropriate reference pattern services program. Each service program performs one or more functions and requires a set of parameters coded in a specific order on the CALL statement.

This topic describes the CALL statements that invoke reference pattern services. Each description includes a syntax diagram, parameter descriptions, and return code and reason code explanations with recommended actions. For examples of how to code the CALL statements, see Reference pattern services coding examples.