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It means you can change your main and sub equipment at the same time with <Page Down> Key.(Only the users who use Master Supremacy Charm or SOF Supremacy Charm can use it.)
If you register main and sub equipment, you can exchange them. In the case that you register equipment to sub or main equip window, the equipment will be registered to main window automatically. In the case that you have registered your equipment to sub window, the equipment will be moved to main window when you try to use it. (After doing it, even if you try to move it to sub window again, you cannot move it by clicking<page-down>.
