The default PF key settings provide the functions anticipated to be most useful.

As distributed on CMS and TSO, the ENTER key is set to the COMMAND command. This means that you can invoke any IDF command by typing it on the command line and pressing ENTER, instead of invoking it by pressing a PF key.

You can redefine the PF keys by issuing a SET command on the command line, by issuing SET commands in your PROFILE (the usual method), or by writing a macro to reset them (occasionally useful). The SET PFK command is described in PFK.

The ENTER key and PF1 through PF24 can be set to any IDF command or to any IDF macro.

By default, PF13 through PF24 are undefined and undisplayed. To display use PFKDISP. Any of those keys that remain undefined are mapped into PF1 through PF12. This makes it easier to use some terminals.