Allright, it's the form made when you start with a new, standard Qt4 GUI-application:

Qt Code: 
  1. /********************************************************************************
  2. ** Form generated from reading UI file 'mainwindow.ui'
  3. **
  4. ** Created: Wed 30. Jun 11:42:55 2010
  5. **      by: Qt User Interface Compiler version 4.6.2
  6. **
  7. ** WARNING! All changes made in this file will be lost when recompiling UI file!
  8. ********************************************************************************/
  9.  
  10. #ifndef UI_MAINWINDOW_H
  11. #define UI_MAINWINDOW_H
  12.  
  13. #include <QtCore/QVariant>
  14. #include <QtGui/QAction>
  15. #include <QtGui/QApplication>
  16. #include <QtGui/QButtonGroup>
  17. #include <QtGui/QDial>
  18. #include <QtGui/QHeaderView>
  19. #include <QtGui/QMainWindow>
  20. #include <QtGui/QMenuBar>
  21. #include <QtGui/QStatusBar>
  22. #include <QtGui/QToolBar>
  23. #include <QtGui/QWidget>
  24. #include "displayclass.h"
  25.  
  26. QT_BEGIN_NAMESPACE
  27.  
  28. class Ui_MainWindow
  29. {
  30. public:
  31.     QWidget *centralWidget;
  32.     QDial *dial;
  33.     displayclass *displayclass1;
  34.     displayclass *displayclass2;
  35.     QMenuBar *menuBar;
  36.     QToolBar *mainToolBar;
  37.     QStatusBar *statusBar;
  38.  
  39.     void setupUi(QMainWindow *MainWindow)
  40.     {
  41.         if (MainWindow->objectName().isEmpty())
  42.             MainWindow->setObjectName(QString::fromUtf8("MainWindow"));
  43.         MainWindow->resize(600, 400);
  44.         centralWidget = new QWidget(MainWindow);
  45.         centralWidget->setObjectName(QString::fromUtf8("centralWidget"));
  46.         dial = new QDial(centralWidget);
  47.         dial->setObjectName(QString::fromUtf8("dial"));
  48.         dial->setGeometry(QRect(280, 10, 50, 64));
  49.         dial->setMaximum(360);
  50.         displayclass1 = new displayclass(centralWidget);
  51.         displayclass1->setObjectName(QString::fromUtf8("displayclass1"));
  52.         displayclass1->setGeometry(QRect(40, 60, 211, 231));
  53.         displayclass2 = new displayclass(centralWidget);
  54.         displayclass2->setObjectName(QString::fromUtf8("displayclass2"));
  55.         displayclass2->setGeometry(QRect(350, 60, 201, 231));
  56.         MainWindow->setCentralWidget(centralWidget);
  57.         menuBar = new QMenuBar(MainWindow);
  58.         menuBar->setObjectName(QString::fromUtf8("menuBar"));
  59.         menuBar->setGeometry(QRect(0, 0, 600, 24));
  60.         MainWindow->setMenuBar(menuBar);
  61.         mainToolBar = new QToolBar(MainWindow);
  62.         mainToolBar->setObjectName(QString::fromUtf8("mainToolBar"));
  63.         MainWindow->addToolBar(Qt::TopToolBarArea, mainToolBar);
  64.         statusBar = new QStatusBar(MainWindow);
  65.         statusBar->setObjectName(QString::fromUtf8("statusBar"));
  66.         MainWindow->setStatusBar(statusBar);
  67.  
  68.         retranslateUi(MainWindow);
  69.         QObject::connect(dial, SIGNAL(valueChanged(int)), displayclass1, SLOT(Input(int)));
  70.         QObject::connect(dial, SIGNAL(valueChanged(int)), displayclass2, SLOT(Input(int)));
  71.  
  72.         QMetaObject::connectSlotsByName(MainWindow);
  73.     } // setupUi
  74.  
  75.     void retranslateUi(QMainWindow *MainWindow)
  76.     {
  77.         MainWindow->setWindowTitle(QApplication::translate("MainWindow", "MainWindow", 0, QApplication::UnicodeUTF8));
  78.     } // retranslateUi
  79.  
  80. };
  81.  
  82. namespace Ui {
  83.     class MainWindow: public Ui_MainWindow {};
  84. } // namespace Ui
  85.  
  86. QT_END_NAMESPACE
  87.  
  88. #endif // UI_MAINWINDOW_H
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Hmm, is instance maybe the wrong term for what I'm trying to do?