The ITEM statements specify the items for the menu bar. The value of the MENU= option is used in a subsequent MENU statement. The Edit item uses a common predefined submenu; the menus for the other items are defined in this PROC step. 
      item 'File' menu=f;
      item 'Edit' submenu=editmnu;
      item 'Scroll' menu=s;
      item 'Help' menu=h;