Using the Add-In Manager
Use the Add-In Manager dialog box to load or unload an add-in. If you close only the visible portions of an add-in—by double-clicking its system menu or by clicking its close button, for example—its forms disappear from the screen, but the add-in is still present in memory.
The add-in object itself will always stay resident in memory until the add-in is disconnected through the Add-In Manager dialog box.
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