Remember, the purpose of this button is to automatically trigger the Ajax refresh action on the progress bar.

切记，这个按钮的目的是在进度工具条上自动激发 Ajax 刷新行为。

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Also, systems may trigger a transaction with a bar code or a number sequence.

同样，系统可以用条形码或者序列号完成交易。

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Even better, the Charms Bar and toggle-trigger on the left side of the screen are both within thumbs reach, so it's easy to move through the OS while still cradling your tablet in a natural position.

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