The APPLICATION module is accessible from the first prompt WHICH MODULE ?, by typing APPLICATION or in short, APP.

If you are currently using multiphase or any other module, you can return to the main prompt by typing RETURN. Note that if you have an unfinished command line, for example set w 100 (no exclamation mark), you can return to the module prompt by typing STOP. Here are 2 examples:

MULTIPHASE OPTION ? def sou
DEFINE WHAT ? stop
MULTIPHASE OPTION ?

Now try:

MULTIPHASE ? return [Return]
WHICH MODULE ? app [Return]
APPLICATION OPTION ?