diff --git a/VerteilteSysteme-Examples/src/verteiltesysteme/mandelbrot/rmi/MGuiRMI.java b/VerteilteSysteme-Examples/src/verteiltesysteme/mandelbrot/rmi/MGuiRMI.java
index 03df54c..6fe7531 100644
--- a/VerteilteSysteme-Examples/src/verteiltesysteme/mandelbrot/rmi/MGuiRMI.java
+++ b/VerteilteSysteme-Examples/src/verteiltesysteme/mandelbrot/rmi/MGuiRMI.java
@@ -1,5 +1,7 @@
 package verteiltesysteme.mandelbrot.rmi;
 
+import java.awt.BorderLayout;
+
 //Mandelbot Example A. Gepperth
 
 import java.awt.Color;
@@ -22,6 +24,8 @@ import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JSlider;
+import javax.swing.JTextField;
+import javax.swing.border.BevelBorder;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
 
@@ -51,7 +55,7 @@ class MyJLabel extends JLabel {
 
 	@Override
 	protected void paintComponent(Graphics g) {
-		super.paintComponent(g);	
+		super.paintComponent(g);
 		g.setColor(Color.black);
 		g.drawRect(this.boxULx, this.boxULy, this.boxW, this.boxH);
 	}
@@ -66,8 +70,10 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 	JButton endButton;
 	JButton backButton;
 	JButton calcButton;
+	JTextField hostTextField;
 	JSlider maxIterations;
 	MyJLabel view;
+	JLabel message;
 	int nrIterations;
 
 	// box management
@@ -79,8 +85,8 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 
 	// how many points in the image?
 	// change if you want a higher resolution
-	public static final int RESX = 600;
-	public static final int RESY = 600;
+	public static int RESX = 600;
+	public static int RESY = 600;
 
 	MGuiRMI() {
 		// set up GUI
@@ -88,17 +94,23 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 		this.panel = new JPanel();
 		this.endButton = new JButton("Ende");
 		this.panel.add(this.endButton);
-		this.backButton = new JButton("Zurueck");
+		this.backButton = new JButton("Zurück");
 		this.panel.add(this.backButton);
 		this.calcButton = new JButton("Rechnen");
+		this.hostTextField = new JTextField(20);
+		this.hostTextField.setText("localhost");
 		this.panel.add(this.calcButton);
+		this.panel.add(this.hostTextField);
 		this.frame.add(this.panel);
-		this.frame.setSize(500, 500);
+		this.frame.setSize(700, 720);
 		this.frame.setVisible(true);
-		this.view = new MyJLabel("Platzhalter");
+		this.view = new MyJLabel();
 		this.maxIterations = new JSlider(0, 50, 30);
 		this.panel.add(this.maxIterations);
 		this.panel.add(this.view);
+		this.message = new JLabel("Status");
+		this.message.setBorder(new BevelBorder(BevelBorder.LOWERED));
+		this.frame.add(this.message,BorderLayout.SOUTH);
 
 		this.endButton.addActionListener(this);
 		this.backButton.addActionListener(this);
@@ -116,16 +128,10 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 		this.boxULy = 0;
 		this.boxW = MGuiRMI.RESX;
 		this.boxH = MGuiRMI.RESY;
+		
+		this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
 		// Non-Gui stuff
-		String host = "";
-		try {
-			Registry registry = LocateRegistry.getRegistry(host);
-			this.remoteCalcObj = (RMIMandelbrotCalculationsInterface) registry.lookup("RMIEchoInterface");
-		} catch (RemoteException | NotBoundException e) {
-			// TODO Auto-generated catch block
-			e.printStackTrace();
-		}
 		this.nrIterations = 1000;
 	}
 
@@ -157,6 +163,7 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 
 		if (ae.getSource() == this.backButton) {
 			System.out.println("Zurueck");
+			// Zoom und Ausschnitt zurücksetzen
 			double ULx = -0.16099999999999995;
 			double ULy = -0.9365333333333333;
 			double LRx = -0.03533333333333327;
@@ -167,68 +174,85 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 			this.boxH = MGuiRMI.RESY;
 			this.view.setBox(this.boxULx, this.boxULy, this.boxW, this.boxH);
 			this.view.repaint();
-			try {
-				this.remoteCalcObj.setView(ULx, ULy, LRx, LRy);
-			} catch (RemoteException e) {
-				// TODO Auto-generated catch block
-				e.printStackTrace();
+			if (this.remoteCalcObj == null)
+			{
+				String message = "Fehler: noch nicht verbunden, noch keine Berechnung durchgeführt";
+				this.message.setText(message);
+				System.out.println(message);
+			}
+			else
+			{
+				try {
+					this.remoteCalcObj.setView(ULx, ULy, LRx, LRy);
+				} catch (RemoteException e) {
+					// TODO Auto-generated catch block
+					e.printStackTrace();
+				}
+				this.message.setText("Ausschnitt zurückgesetzt");
 			}
 		} else
 
 		if (ae.getSource() == this.calcButton) {
-			System.out.println("Rechnen");
-			long timestampStart = System.currentTimeMillis();
-			
-			double ULx = 0;
-			double ULy = 0;
-			double LRx = 0;
-			double LRy = 0;
+			String hostname = this.hostTextField.getText();
+			System.out.println("Verbinde mit RMI Registry auf Host: " + hostname);
 			try {
+				Registry registry = LocateRegistry.getRegistry(hostname);
+				this.remoteCalcObj = (RMIMandelbrotCalculationsInterface) registry.lookup("RMIEchoInterface");
+				System.out.println("Rechnen");
+				long timestampStart = System.currentTimeMillis();
+
+				//this.boxW = this.boxW / 2;
+				//MGuiRMI.RESX = MGuiRMI.RESX / 2;
+				
+				double ULx = 0;
+				double ULy = 0;
+				double LRx = 0;
+				double LRy = 0;
+
 				ULx = this.remoteCalcObj.getULx();
 				ULy = this.remoteCalcObj.getULy();
 				LRx = this.remoteCalcObj.getLRx();
 				LRy = this.remoteCalcObj.getLRy();
-			} catch (RemoteException e) {
-				// TODO Auto-generated catch block
-				e.printStackTrace();
-			}
-			double w = LRx - ULx;
-			double h = LRy - ULy;
-			ULx = ULx + w * this.boxULx / (double) MGuiRMI.RESX;
-			ULy = ULy + h * this.boxULy / (double) MGuiRMI.RESY;
-			w *= this.boxW / (double) (RESX);
-			h *= this.boxH / (double) (RESX);
-			LRx = ULx + w;
-			LRy = ULy + h;
-			System.out.println(ULx + "/" + ULy + "/" + LRx + "/" + LRy);
-			this.boxULx = 0;
-			this.boxULy = 0;
-			this.boxW = MGuiRMI.RESX;
-			this.boxH = MGuiRMI.RESY;
-			int[] colors = null;
-			try {
+
+				double w = LRx - ULx;
+				double h = LRy - ULy;
+				ULx = ULx + w * this.boxULx / (double) MGuiRMI.RESX;
+				ULy = ULy + h * this.boxULy / (double) MGuiRMI.RESY;
+				w *= this.boxW / (double) (RESX);
+				h *= this.boxH / (double) (RESX);
+				LRx = ULx + w;
+				LRy = ULy + h;
+				System.out.println(ULx + "/" + ULy + "/" + LRx + "/" + LRy);
+				this.boxULx = 0;
+				this.boxULy = 0;
+				this.boxW = MGuiRMI.RESX;
+				this.boxH = MGuiRMI.RESY;
+				int[] colors = null;
+
+				//this.remoteCalcObj.setView(ULx, ULy, LRx, LRy);
 				this.remoteCalcObj.setView(ULx, ULy, LRx, LRy);
 				this.remoteCalcObj.iterateAllPoints(this.maxIterations.getValue() * 1000, MGuiRMI.RESX, MGuiRMI.RESY);
 				int[] lookupTable = generateLookupTable(this.maxIterations.getValue() * 1000);
 				colors = new int[MGuiRMI.RESX * MGuiRMI.RESY];
 				MGuiRMI.applyLookupTable(remoteCalcObj.getResult(), colors, lookupTable);
-			} catch (RemoteException e) {
-				// TODO Auto-generated catch block
-				e.printStackTrace();
-			}
 
-			BufferedImage colorImage = new BufferedImage(MGuiRMI.RESX, MGuiRMI.RESY, BufferedImage.TYPE_INT_ARGB);
-			colorImage.setRGB(0, 0, MGuiRMI.RESX, MGuiRMI.RESY, colors, 0, MGuiRMI.RESX);
-			this.view.setIcon(new ImageIcon(colorImage));
+				BufferedImage colorImage = new BufferedImage(MGuiRMI.RESX, MGuiRMI.RESY, BufferedImage.TYPE_INT_ARGB);
+				colorImage.setRGB(0, 0, MGuiRMI.RESX, MGuiRMI.RESY, colors, 0, MGuiRMI.RESX);
+				this.view.setIcon(new ImageIcon(colorImage));
 
-			this.view.setBox(this.boxULx, this.boxULy, this.boxW, this.boxH);
-			this.view.repaint();
+				this.view.setBox(this.boxULx, this.boxULy, this.boxW, this.boxH);
+				this.view.repaint();
+
+				long timestampEnd = System.currentTimeMillis();
 
-			long timestampEnd = System.currentTimeMillis();
+				String timeElapsed = "Dauer: " + ((timestampEnd - timestampStart) / 1000.0) + " sec";
+				System.out.println(timeElapsed);
+				this.message.setText(timeElapsed);
+			} catch (RemoteException | NotBoundException e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
 
-			String timeElapsed = "Zeit: " + ((timestampEnd - timestampStart) / 1000.0) + " sec";
-			System.out.println(timeElapsed);
-			this.view.setText(timeElapsed);
 		}
 	}
 
@@ -238,6 +262,7 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 		this.boxW = 1;
 		this.boxH = 1;
 		this.view.setBox(this.boxULx, this.boxULy, this.boxW, this.boxH);
+		this.message.setText("boxULx: " + this.boxULx + " boxULy: " + this.boxULy + " boxW: " + this.boxW + " boxH: " + this.boxH);
 	}
 
 	public void mouseDragged(MouseEvent e) {
@@ -247,6 +272,7 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 		this.boxW = m;
 		this.boxH = m;
 		this.view.setBox(this.boxULx, this.boxULy, this.boxW, this.boxH);
+		this.message.setText("boxULx: " + this.boxULx + " boxULy: " + this.boxULy + " boxW: " + this.boxW + " boxH: " + this.boxH);
 		this.view.repaint();
 	}
 
@@ -254,6 +280,7 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 
 		if (e.getButton() == MouseEvent.BUTTON1) {
 			this.view.repaint();
+			this.message.setText("Gesetzt: boxULx: " + this.boxULx + " boxULy: " + this.boxULy + " boxW: " + this.boxW + " boxH: " + this.boxH);
 		}
 	}
 
@@ -272,7 +299,7 @@ public class MGuiRMI implements ActionListener, ChangeListener, MouseListener, M
 	// process a new slider value
 	public void stateChanged(ChangeEvent ce) {
 		if (ce.getSource() == this.maxIterations) {
-			//System.out.println("Neuer Wert");
+			// System.out.println("Neuer Wert");
 			this.nrIterations = this.maxIterations.getValue() * 1000;
 		}
 	}