pwman_place(left, top, 0)
moves the PrintWindowManager to the indicated location in pixel
coordinates where 0,0 is the top left corner of the screen.
It is intended that if you build an interface by placing windows
near the top and build right then the session you save will
be portable to other window managers and other systems with
different screen sizes.
If the third argument is 0, then the window is placed but hidden.
neuron/general/function/pwmplace.hel : May 13 2012