当使用了异步调用，而调用的任务需要查找所调用任务在特定位置生成的输出才能够继续后续操作时，这种方法是特别重要的。
This is especially important when asynchronous invocation is used where the calling task has to look for the output of the called task appearing at a particular location to continue further.
这意味着后续SQL OPEN和CLOSE操作只是将游标重新定位到结果集的第一行。
This means that subsequent SQL OPEN and CLOSE operations will merely reposition the cursor to the first row of the result set.
我猜测iphone使用这些数据在后续位于同一位置时来定位基站。
My guess is that the iPhone USES this data to help it locate cell towers if it is in the same location again in the future.
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