Hi,
i think its calulating the x,y positions of the interface objects according to the "WindowWidth" and "WindowHeight" system variables.
For example:
positioning the right top object to:
y: YOffset
x: WindowWidth - ObjectWidth - XOffset
Where as the offsets define how far from the edge the object should be
Same goes for the others:
right bottom:
x: WindowHeight - ObjectHeight - yOffset
y: WindowWidth - ObjectWidth - XOffset
left top:
y: yOffset
x: xOffset
left bottom:
y: WindowHeight - ObjectHeight - yOffset
x: xOffset