>Psychtoolbox>PsychOneliners

kPsychGUIWindowWMPositioned – Leave onscreen window placement to system.

This flag can be passed to the optional ‘specialFlags’ parameter of
Screen(‘OpenWindow’, …) or PsychImaging(‘OpenWindow’, …),
in addition to the kPsychGUIWindow flag. It has not much of an effect for
non GUI windows.

It allows the systems GUI window manager to place the window at its own
discretion, that is, the (x,y) position of the windows top-left corner,
as provided in the ‘rect’ parameter, is ignored and placement of the
window is left to where the operating system deems it most ergonomical.