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http://www.consolegames.ro/forum/sho....php?p=1373608

"The handheld unit of the Nintendo Switch contains all the hardware components of the system — games are running directly on the device, which is why you can slide the Switch’s Joy-Con controllers onto either side of it. When you drop the unit into the dock, the dock begins charging it and outputting the game to an external screen over an HDMI connection."