Never make assumptions about the geometry of the “desktop” or the arrangement of the screens. Make use of the following functions from kglobalsettings.h: static QRect KGlobalSettings::splashScreenDesktopGeometry(); static QRect KGlobalSettings::desktopGeometry(const QPoint& point); static QRect KGlobalSettings::desktopGeometry(QWidget *w); Use splashScreenDesktopGeometry() to determine the geometry of the desktop when you want to display an application splash screen. Use desktopGeometry() to determine the geometry of the desktop with respect to a given point on the desktop, or with respect to a given widget. Do not use the Qt class QDesktopWidget to determine these values yourself. The KDE functions take the user’s settings into account, something the Qt functions cannot do. It is ideal to try to avoid using the desktop geometry altogether. Your application will be much more standards compliant if you let the window manager place your windows for you. When this is not possible, you hav