\class QScreen
\brief The QScreen class is used to query screen properties.
+ A note on logical vs physical dots per inch: physical DPI is based on the
+ actual physical pixel sizes when available, and is useful for print preview
+ and other cases where it's desirable to know the exact physical dimensions
+ of screen displayed contents.
+
+ Logical dots per inch are used to convert font and user interface elements
+ from point sizes to pixel sizes, and might be different from the physical
+ dots per inch. The logical dots per inch are sometimes user-settable in the
+ desktop environment's settings panel, to let the user globally control UI
+ and font sizes in different applications.
+
\inmodule QtGui
*/