ession is selected then sections can be inserted into any session. 
If a section is selected then comments and commands can be inserted into any
of the sections of the selected type.
<p>
<li><b>Insert</b>: Inserting an object into the parameter file consist of 
up to four steps: select the appropriate view from the view menu, 
select an object from the insert menu, select a file in case a file is
to be inserted, and finally insert the object
by clicking on any of the insert buttons
<IMG SRC=button_insert.gi