In the ISPF configuration table keyword file, this exit is set with keyword MEMBER_LIST_FILTER_PROGRAM_EXIT.

The member list filter exit provides you with two capabilities:

1. You can dictate which members of a partitioned data set or concatenation of partitioned data sets are to be included in a member list when it is created.
2. You can specify which members of a member list are to be selected when the SELECT primary command is issued.

If a member list filter exit routine is not defined, PDF uses its default pattern matching conventions to determine which members are displayed, and which members are selected if the SELECT primary command is issued.

For each case in which the member list filter exit routine would be invoked, it is called first to allow verification or modification of the specified pattern (Analyzing patterns with the member list filter exit), and then once for each member in the data set that matches the pattern (Analyzing member names with the member list filter exit). The exit routine, through return codes, dictates which members are to be included in the member list, or selected if the SELECT primary command is issued.

PDF invokes the member list filter exit routine using standard linkage conventions. The exit routine must be a program.

From the exit routine, any of the PDF or ISPF services can be invoked. However, be careful when invoking services that generate a member list as part of their internal processing (LMMLIST, LMMDISP, LMMOVE, LMPROM, LMPRINT, and LMMSTATS). These invocations would result in a recursive call to the exit routine.