The SETHELP command specifies a HELP entry that contains user-written information for this application. The semicolon that appears after the HELP entry name allows the HELP command to be included in the string. The HELP command invokes the HELP entry. 
            selection a 'sethelp proclib.menucat.app.help;help';
            selection k 'sethelp proclib.menucat.keys.help;help';
run;
quit;