Specifying the APF list

The PROGxx and IEAAPFxx parmlib members allow you to define the format and contents of the APF list. You can use either member, but IBM® suggests using PROGxx, which offers the following advantages over IEAAPFxx:

You can specify multiple PROGxx parmlib members using the PROG=xx system parameter
You can specify a dynamic or static APF list format; the dynamic format allows you to update the APF list at any time during normal processing or at IPL.
You can specify an unlimited number of libraries in the APF list.

Note: You can use both members, but the resulting list is dynamic only when you specify dynamic format in PROGxx.

If you specify a dynamic APF list format in PROGxx, you can specify the PROG=xx system parameter to set one or more current PROGxx parmlib members at IPL, or the operator can enter a SET PROG=xx command to set a current PROGxx parmlib member during normal processing. When the operator enters a SET PROG=xx command to update a dynamic APF list, the updated APF list remains active only for the duration of the current IPL. For information about how to use the SET PROG=xx command to specify the current PROGxx parmlib member, see z/OS MVS System Commands.

If you currently use the IEAAPFxx parmlib member to define the APF list, you can convert the format of IEAAPFxx to a PROGxx format using the IEAAPFPR REXX exec provided by IBM.