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In ASI studio, if you look in the "Gear" selection menu there is a section there to select the EAF, I am not in front of a PC at the moment where I can access one to check how it works but there is a pop up menu that appears when you hover the mouse over the right edge of the imaging screen, the bottom selection there is for focus. I would assume you select the EAF in the "Gear" menu and then drive it in the pop up focuser menu.
The hand control I believe you can just plug in to drive it directly but I assume the EAF itself needs to be plugged in to a powered up USB port to power up. The manual does not mention if the hand control has an internal battery and will drive the EAF stand-alone without a PC connected.
If I was building it I would have a 9V battery in the hand controller and have it able to drive the focus motor stand alone, but I don't know if that is what ZWO did.
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