the program. This is the
only way the program will know that it should save its current lens
and close all of its files. Exiting the program in any other manner
will produce unpredictable results and you will lose data! You may
also exit the program using the close window option or by chossing
EXIT from the FILE menu.</p>

<h3>Commands to be Entered During the Tutorial</h3>

<p>Only commands shown <strong>in BOLD, UPPERCASE</strong>are meant to
be input during this tutorial. All other type is to be consider