ablishes the ZB Launch Mode control port.
   You can read more about the theory behind ZB Launch in the
   <a href="http://mjrnet.org/pinscape/BuildGuideV2/BuildGuide.php?sid=zblaunch">Pinscape Build Guide</a>.
</p>

<h4>Virtual output ports</h4>
<p>
   The port in the example above with type "virtual" defines a logical output port that DOF can
   send commands to, but which doesn't control any physical device.  This
   can be useful for a number of special effects.  For example, you can set
   up a logical