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MENU_EDIT()                                                         C_EXAM04
   Modifies the attributes of a menu.

   Syntax
         MENU_EDIT(nMenuNum [,nHighlight] [,nOnOrOff] [,nMenuItem])

   Arguments
         nMenuNum    Sets the number of the menu to modify. (Max 24)
         OPTIONAL PARAMETERS
         nHighlight  Sets the highlight on or off.
                     0 = Don't highlight when mouse hits button.
                     1 = Highlight when mouse hits button.
                     2 = Highlight only if mouse cursor on button.
         nOnOrOff    Sets the menu on or off.
                     0 = Turn the menu off without making it disappear.
                     1 = Turn the menu on.
         nMenuItem   Resets menu item to highlight.
                     0 = Turn off current highlighted item.

   Returns
         None

   Description
         MENU_EDIT() modifies certain attributes of an existing menu.

         nHighlight allows you to change whether the menu will act like a
         follow menu, i.e., the current selection will 'follow' the mouse
         cursor. Otherwise, the highlight will change only when the left
         mouse button is pressed on a new menu button.

         nOnOrOff turns the menu temporarily off without clearing it from
         the screen.

         nMenuItem highlights a new menu button. If a 0 is entered then
         the currently highlighted menu item is turned off.