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<h1>Introduction to Main Features</h1>
On the Start page<p>
<img src="Images/start_session.png">
<p>
several options may be selected. We start with <b>A new program</b>.
In the emerging window, you may specify necessary details to start a
session.
<p>
<img src="Images/start_details.png">
<p>
Starting the session should open the source file containing the
<b>main</b> function.
<p>
<img src="Images/start_simple_01.png">
<p>
Most important is the stepping toolbar in the top<p>
<img src="Images/start_toolbar.png">
<p>
<table><tr><td><img src="Images/start_break.png"></td>
<td>
Beside the source code are line numbers. You may click on one of the
boxes and that way set a breakpoint. Pressing <b>Go</b> in the toolbar
the current line will be marked yellow. You may <b>right click</b> on
one of the variables and the emerging window, to the right, opens
certain possibilities to inpect the item. Stopped at line 10 we may dive
for variable <tt>nmax</tt> before the line was executed.
</td>
<td align=bottom><img src="Images/start_dive.png"></td>
</tr>
</table>
<p>
<img src="Images/start_dive_nmax.png">
<p>
For the moment we notice the address, there the variable is stored, its
type and its current value, which will change to <tt>100</tt> after
execution of the line (press <tt>Next</tt> in the toolbar). Above the
source code information about the stack is provided.
<p>
<img src="Images/start_stack.png">
<p>
<table><tr><td>
To the left the <tt>trace</tt>information and to the right the current
<tt>stack frame</tt> with information about function parameters, local 
variables, registers.
<p>
Proceeding further in the program execution the colours and contents of
the bar above the <tt>stack</tt> will change (see right) indicating an
error in the process and its explanation for <tt>thread 1</tt>.
</td><td align=bottom>
<img src="Images/start_process.png">
</td>
</tr>
</table>

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