Allows mixing of Xt/Motif and Qt widgets. This class is part of the Qt Xt/Motif Extension. ... QXtApplication  ( int & argc, char ** argv, const char * appclass=0, XrmOptionDescRec * options=0, int num_options=0, const char ** resources=0 )  . ... The QXtApplication and QXtWidget classes allow old Xt or Motif widgets to be used in new Qt applications. They also allow Qt widgets to be used in primarily Xt/Motif applications. ... Constructs a QApplication and initializes the Xt toolkit. ...