what is difference between potential energy and total energy in Forcite

Hello everyone,

I would like to know the diffeernce between the potential energy and total energy in Forcute in MS.

When I ran a dynamic like NVT, I found there were several lines in energy window (potential, kinetic, non-bond, total), and also there is total energy in Status window. if I write a script like,
\\\$calcSheet->Cell(1, 1) = \\\$allDoc->PotentialEnergy, does the PotentialEnergy refer to the potential energy or the total energy? and what is the difference? 

Thanks in advance.
Shining