Session, Resettable and Capture File Tabs
The Session, Resettable, and Capture File tabs are parts of the Statistics and Errors windows.
Information about all data collected since the analyzer was started is shown in the Session tab. The Session tab cannot be reset; in this sense, it is like the odometer on a car. The odometer on a car shows you all the miles driven since the car was built, and the Session tab shows you all the data collected since the analyzer was started.
If you think of the Session tab as the odometer, then
the Resettable tab is the trip odometer. It can be reset, and allows you
to record statistics for a new "trip". In this way you can effectively
start a new session without having to restart the analyzer.
If the Reset button 
was pressed during the capture, then the numbers on
this tab differs from the numbers on the Session tab.
The timestamp appearing in Session tab fields is the timestamp of when the analysis began. The timestamp appearing in the Resettable tab fields is the timestamp either when the analysis began or when the last Reset was initialted.
The Capture File tab shows information on the data that is currently in the capture. If the capture file had become full, the analyzer began to overwrite the oldest data and put new data in its place. This is called "wrapping". If the file wrapped, the numbers on the Capture File tab is smaller than those on the Session tab.
Occasionally some of the statistics read "n/a", for Not Available. This happens for various reasons. For example, many of the items on the Capture File tab become not available if the buffer becomes full and wraps. When this happens, the analyzer can no longer provide accurate statistics for the data in the file, because some of the data that the statistics are based on has been lost.