ble. Examples:</p>

<pre>
input x
input $1
</pre>




<br />

<a name="len"></a>
<h3>LEN</h3>
<p>Stores the length of a string variable in a numeric variable. Example:</p>

<pre>
$1 = "Hello world"
len $1 x
</pre>




<br />

<a name="listbox"></a>
<h3>LISTBOX</h3>
<p>Displays an dialog box containing a list of options, specified by a comma-separated list in the first string. The second
and third strings provide help text, and the chosen option (from 1) is stored in the specified variable (or zero if the Es