Windows Task Manager process ordering

Is there any rhyme or reason to the default ordering of the Windows Task Manager processes tab under Windows XP? It seems totally random.

And when sorting by CPU or memory, why do they default to ascending order? Under what circumstances would I be interested in what program is consuming the least amount of CPU or memory? You have to click the column header twice to get to descending order.

Without replacing it with something like Process Explorer, which I find can be a little heavyweight on an underpowered machine, is there any way to improve the ordering of this tab?

Answer

By default it sorts by PID (process ID) descending. So basically most recently created at the top of the list.

You can see this by going to View -> Select Columns and checking the PID box.