This would be a neat number to know, but in my experimenting, it seems it is harder to find out that one might think.
The DesktopX object thomassen suggested does show a total, but it is again a total PER SECOND, rather than the sum total for a session I think wyclef77 is looking for.
I may have overlooked somehting, but I couldn't find a PDH Meter class that just spits out this number. Some meters in Performance Object: Terminal Services Session sounded promising, but I could not get values from them. For example, I set a text layer to display a meter defined as Terminal Services Session->Input Bytes. The first time I did it, it showed some numbers, then settled at zero and doesn't change anymore. Other ones sometimes consistently output values but 1> I'm not sure what that value represents, and 2> For the total we want the number should only increase, and these values sometimes decrease.
So, if it is possible to know the total number of bytes sent/recieved for a session using SysStats, I too don't know how to do it. Maybe you could get a rough estimate by summing per second amounts, but again even this is beyond my current skills.
Sorry this is so little help. But at least I bumped the thread - maybe someone who knows will be more likely to see it and tell us.
Question also asked and also not answered here http://www.aqua-soft.org/board/showthread.php?t=24642 at aqua-soft.
Check out http://www.deviantart.com/view/17488332/ for what I _have_ been able to do. (Apologize for shameless self-plug).
gl, rr