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+<h2>Introduction</h2>
+
+
+<p>
+	The LTPDA package contains a sophisticated graphical programming interface which allows the user to construct and execute 
+	data analysis pipelines entirely graphically.
+</p>
+
+  <img src="images/model_1.png" alt="A LTP Analysis in Simulink" border="1">
+  <br>
+  <br>
+  <br>
+  <br>
+<p>
+	The Simulink drawing interface is used to construct the analysis pipelines. The blocks that compose the analysis
+	pipelines are drawn from the LTPDA blockset. The LTPDA Analysis GUI then executes the commands represented by each
+	block in the appropriate order in order to achieve the desired analysis pipeline.
+    <br><br>
+    To start the LTPDA GUI use the command <tt>ltpdagui</tt> .
+    
+  <div class="fragment"><pre>
+      >> ltpdagui
+  </pre></div>  
+    <br>
+    If there's no open LTPDA GUI window, the user will be asked to log in:<br><br>
+    <img src="images/login.png" alt="A simple analysis" border="1"><br><br>
+    These data are not mandatory, as long as the user do not want to connect to a LTPDA Repository, for example to retrieve previous
+    analyses or to send in his own work. If the user just wants to use the software to compile trials or personal analyses, not meant to
+    be shared with others, he can leave these fields empty: the GUI will identify him as anonymous ('<tt>JohnDoe</tt>'), and this name
+    will be stored into every produced model.<br>
+    On the contrary, if the GUI has to produce shared results, i.e. if the user want to submit/retrieve from an LTPDA Repository,
+    these login and password are those necessary to access the repository database. The user must possess a valid account, which
+    can be requested to the database administrator.<br>
+    The username will be used also to ensure better traceability, storing the name itself into a short description created using
+    the LTPDA GUI.<br><br>
+    However, it's possible at anytime to log off and re-log in, using different data, so it will be possible to type in valid
+    credentials to access a repository only when needed.
+    <br><br><br>
+    
+    <hr>
+    The first appearance of the GUI is:<br><br>
+    <img src="images/ltpdagui_1.png" alt="A simple analysis" border="1">
+    <br><br>
+    The upper part of the window lists all the possible panels: clicking on the corresponding tab the proper panel
+    will be drawn below.<br><br>
+    The help associated to each panel will be dealt into different pages.
+    <br><br><br>
+    
+</p>
+