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How fast do 2 iphones exchange tilt / position information?

I was wondering how much time is required to transfer information about the tilt and position (and not gps) of one particular iphone to another. Could 2 iphones send and receive this information at the same time? What about 3 iphones? I'm interested in an application that can simultaneously send and receive and make conditional decisions based on this information received in just half a second.

Any shot possible? If so, is Bluetooth or Wi-Fi better?

Thanks ton, Jake

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Bluetooth 3.0 iPhone- , NDA, - , . , , , Bluetooth, FAR .

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, , - Wi-Fi Cell Network. Bonjour Wi-Fi, , . WiTap.

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, WiFi , Bluetooth , (< 1k). , , UIAccelerometer:

http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIAccelerometer_Class/Reference/UIAccelerometer.html

http://developer.apple.com/iphone/library/samplecode/AccelerometerGraph/index.html#//apple_ref/doc/uid/DTS40007410

The trick is that the refresh rate is partially controlled by the needs of the system, so a window may appear (while the system is trying to update the orientation of the device) when your application does not receive updates.

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