There is only one function relevant to the application class, app-on-init. If an application defines a function of this name, the wxCLIPS user interface can start up the application from a standard menu item, or straightaway if the -start flag is used on the command line. This function is not relevant to embedded versions of wxCLIPS.
If app-on-init is defined, it must initialize the main frame and return its integer identifier, or zero if the application could not be initialized.