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Methods - Markov regenerative process:
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 Button bar
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   * Node
   Click on the button "Node", then click on the panel where you want the new
   node to be created.
   
   * Arc
   Click on the button "Arc", then click on a node where you want to have the
   new arc created. Drag the mouse and release the mouse on the other node to complete
   the creation of the arc.

   * Modif. Arc
   Click on the button "Modif. Arc", then at that time, the intermediate points of the current
   arcs in the models appears as a black rectangle. You can move these intermediate points by clicking
   on it then dragging the mouse and releasing in the new location. You can also create new intermediate
   points by clicking on an arc then dragging the mouse, an new intermediate point is now displayed.	   

   * Delete
   Click on the button "Delete", then click on an object (node or arc) to have this object
   deleted. If you delete a node, all the arcs connected to this node will also be deleted.
      
   * Clear   
   Click on the button "Clear" to clear the current model. 
   A frame appears on the screen and the user should confirm this action by
   clicking on "Yes".
    
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When the user clicks on a object, a pop-up appears on the screen. We will explain for each object, 
the methods available:


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 Panel 
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   * "Label in the center of the node" action
   Put automatically the label of each node in the center of the node. 

   * "Copy" action
   The user can select the part of the design, he wants to copy.
   By pressing the mouse on the panel then dragging the mouse and releasing it,
   a rectangle with green border is now displayed on the screen with the nodes contained
   in this rectangle now with the yellow color.
   Click now on copy.
     

   * "Cut" action
   The user can select the part of the design, he wants to cut.
   By pressing the mouse on the panel then dragging the mouse and releasing it,
   a rectangle with green border is now displayed on the screen with the nodes contained
   in this rectangle now with the yellow color.
   Click now on cut.

   * "Paste" action
   After the user has copied or cut a part of the model by creating a rectangle,
   the action "Paste" is now available and the user after clicking on "Paste" needs to
   click on the Panel where he wants to have the new objects (nodes/arcs) to be pasted.	

   * "Delete" action
   The user can select the part of the design, he wants to delete.
   By pressing the mouse on the panel then dragging the mouse and releasing it,
   a rectangle with green border is now displayed on the screen with the nodes contained
   in this rectangle now with the yellow color.
   Click now on delete.

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 Node 
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   * "Change Name" action
   Used to change the name of a node.


   * "Delete" action
   When a node is removed, all the arcs which were connected to it will be removed also.


   * How to move nodes ?
   Click on "Move" from the button bar     
   "Left dragging" action:

   Nodes can be moved by clicking on a node, then dragging the mouse to the new location.


   * How to draw arcs ?
   Click on "Move" from the button bar     
   "Left dragging" action

   Arcs are drawn by clicking (Left button of the mouse) on a node, then dragging the mouse, 
   by releasing it over another node which should be connected 
   by the new arc. The release of the button, inside the panel (and not on a node), will cancel the action 
   of drawing the arc.

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 Arc 
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   * "Property" action
   A value for the arc may be entered through this action. 
   
   After entering and validating the new value, this value will be displayed inside the panel, 
   in the middle of the arc selected.


   * "Delete" action
   This removes an arc.

