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OnMenu -- Enable the given menu or menu item.
OnMenu( Window, MenuNumber ) A0 D0 VOID OnMenu( struct Window *, UWORD );
This command enables a sub-item, an item, or a whole menu. This depends on the contents of the data packed into MenuNumber, which is described in the Intuition Reference Manual.
Window = pointer to the window MenuNumber = the menu piece to be enables
None
OffMenu(), ResetMenuStrip()
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