Own window frame for the application
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Take a look at "QWidget::setWindowFlags()":http://qt-project.org/doc/qt-5.1/qtwidgets/qwidget.html#windowFlags-prop.
For building a custom frame, you need to use platform-specific APIs, Qt will not help you there.
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QWindow has setFlags(), see "the documentation here":http://qt-project.org/doc/qt-5.1/qtgui/qwindow.html#flags-prop