The Nokia N810 has an OTG or On-The-Go USB controller, it allows the device to function in both client and host mode. By default it is in client mode so when you plug it into your computer it acts as a USB storage device. It can be put into host mode either by running a program on the tablet that will put it into host mode or by using the OTG trigger. The USB plug on the tablet has 5 pins rather than just the standard 4 USB uses. If the extra pin is grounded it will put the N810 into host mode. ...