The ISPF editor assumes that any unknown primary command is a macro, and it also assumes that the macro has been implemented as a CLIST or REXX exec. You can define a macro as a program macro either by entering a DEFINE command or by prefixing the macro name with an exclamation point (!) when you type the macro name on the command line.

If a macro named FINDIT is a CLIST or REXX exec macro, for example, you can run it by typing FINDIT on the command line and pressing Enter. If it is a program macro, you can type !FINDIT, or FINDIT if it had previously been defined as a program macro by the DEFINE command. The first time you enter a macro with an exclamation point (!) prefix implicitly defines that macro as a program macro. Thereafter, you can omit the prefix.

DEFINE name PGM MACRO