The rotation lock disables iPad from automatically switching orientation upon detection through its sensors. However, it will not disable usage of the accelerometer. So you can still play games which include motion controls. To use the simply flick the switch on the right hand side of your iPad. Alternatively, double press the home button to activate multitasking slide the bottom panel bar towards the right. And touch the rotation lock button.
The iPad Tip Series 6 - Rotation Lock on iPad
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