new file mode 100644
--- /dev/null
+++ b/gui/src/MainWindow.h
@@ -0,0 +1,194 @@
+/* Quint - A graphical user interface for Octave
+ * Copyright (C) 2011 Jacob Dawid
+ * jacob.dawid@googlemail.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QtGui/QMainWindow>
+#include <QThread>
+#include <QTabWidget>
+#include <QMdiArea>
+#include <QStatusBar>
+#include <QToolBar>
+#include <QQueue>
+#include "OctaveTerminal.h"
+#include "OctaveLink.h"
+#include "VariablesDockWidget.h"
+#include "HistoryDockWidget.h"
+#include "FilesDockWidget.h"
+#include "BrowserWidget.h"
+#include "IRCWidget.h"
+
+// Octave includes
+#undef PACKAGE_BUGREPORT
+#undef PACKAGE_NAME
+#undef PACKAGE_STRING
+#undef PACKAGE_TARNAME
+#undef PACKAGE_VERSION
+#undef PACKAGE_URL
+#include "octave/config.h"
+
+#include "octave/debug.h"
+#include "octave/octave.h"
+#include "octave/symtab.h"
+#include "octave/parse.h"
+#include "octave/unwind-prot.h"
+#include "octave/toplev.h"
+#include "octave/load-path.h"
+#include "octave/error.h"
+#include "octave/quit.h"
+#include "octave/variables.h"
+#include "octave/sighandlers.h"
+#include "octave/sysdep.h"
+#include "octave/str-vec.h"
+#include "octave/cmd-hist.h"
+#include "octave/cmd-edit.h"
+#include "octave/oct-env.h"
+#include "octave/symtab.h"
+#include "cmd-edit.h"
+
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+extern OCTINTERP_API YY_BUFFER_STATE create_buffer (FILE *f);
+extern OCTINTERP_API void switch_to_buffer (YY_BUFFER_STATE buf);
+extern OCTINTERP_API FILE *get_input_from_stdin (void);
+
+// System
+#include <termios.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <iostream>
+#include <vector>
+#include "pty.h"
+
+class OctaveMainThread;
+class OctaveCallbackThread;
+
+/**
+  * \class MainWindow
+  *
+  * Represents the main window.
+  */
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+    bool isRunning() { return m_isRunning; }
+    OctaveTerminal *octaveTerminal() { return m_octaveTerminal; }
+    VariablesDockWidget *variablesDockWidget() { return m_variablesDockWidget; }
+    HistoryDockWidget *historyDockWidget() { return m_historyDockWidget; }
+    FilesDockWidget *filesDockWidget() { return m_filesDockWidget; }
+
+public slots:
+    void handleOpenFileRequest(QString fileName);
+    void reportStatusMessage(QString statusMessage);
+    void openWebPage(QString url);
+    void handleSaveWorkspaceRequest();
+    void handleLoadWorkspaceRequest();
+    void handleClearWorkspaceRequest();
+    void handleCommandDoubleClicked(QString command);
+    void alignMdiWindows();
+    void openBugTrackerPage();
+    void processSettingsDialogRequest();
+
+protected:
+    void closeEvent(QCloseEvent *closeEvent);
+    void readSettings();
+    void writeSettings();
+
+private:
+    void construct();
+    void establishOctaveLink();
+    QMdiArea *m_centralMdiArea;
+
+    // Mdi sub windows.
+    OctaveTerminal *m_octaveTerminal;
+    BrowserWidget *m_documentationWidget;
+    IRCWidget *m_ircWidget;
+
+    QMdiSubWindow *m_octaveTerminalSubWindow;
+    QMdiSubWindow *m_documentationWidgetSubWindow;
+    QMdiSubWindow *m_ircWidgetSubWindow;
+
+    // Dock widgets.
+    VariablesDockWidget *m_variablesDockWidget;
+    HistoryDockWidget *m_historyDockWidget;
+    FilesDockWidget *m_filesDockWidget;
+
+    // Toolbars.
+    QStatusBar *m_statusBar;
+
+    QString m_settingsFile;
+
+    // Threads for running octave and managing the data interaction.
+    OctaveMainThread *m_octaveMainThread;
+    OctaveCallbackThread *m_octaveCallbackThread;
+    bool m_isRunning;
+};
+
+class OctaveMainThread : public QThread {
+    Q_OBJECT
+public:
+    OctaveMainThread(QObject *parent)
+        : QThread(parent) {
+    }
+protected:
+    void run() {
+        int argc = 3;
+        const char* argv[] = {"octave", "--interactive", "--line-editing"};
+        octave_main(argc, (char**)argv, 1);
+        main_loop();
+        clean_up_and_exit(0);
+    }
+};
+
+class OctaveCallbackThread : public QThread {
+    Q_OBJECT
+public:
+    OctaveCallbackThread(QObject *parent, MainWindow *mainWindow)
+        : QThread(parent),
+          m_mainWindow(mainWindow) {
+    }
+
+protected:
+    void run() {
+        while(m_mainWindow->isRunning()) {
+
+        // Get a full variable list.
+        QList<SymbolRecord> symbolTable = OctaveLink::instance()->currentSymbolTable();
+        if(symbolTable.size()) {
+            m_mainWindow->variablesDockWidget()->setVariablesList(symbolTable);
+        }
+
+        // Collect history list.
+        string_vector historyList = OctaveLink::instance()->currentHistory();
+        if(historyList.length()) {
+            m_mainWindow->historyDockWidget()->updateHistory(historyList);
+        }
+
+            usleep(100000);
+        }
+    }
+private:
+    MainWindow *m_mainWindow;
+};
+
+#endif // MAINWINDOW_H