e PARAMFILE in this manual). When an existing file is opened, the
original file is copied into PARAMFILE~ (similarly to the emacs editor). 
If the editor is exited or a new file is opened without saving the edited file,
then the last state of the file is saved into PARAMFILE.bak.

The GUI consists of three frames: 
<ul>
<li><A HREF=#TOPFRAME>top frame</A> with various <A HREF=#BUTTONS>buttons</A>
   and <A HREF=#SELECTMENUS>select menus</A>,
<li><A HREF=#LEFTFRAME>left frame</A> showing the parameter file,
