title: PNPDeviceID Format
body: <p>I'm working on developing a WMI query for my application.  It needs to find the assigned virtual COM port for a given VID/PID.  Using the WMI Code Creator I have found that...</p>
  
  <ul>
  <li>Namespace: root\CIMV2</li>
  <li>Class: Win32_SerialPort</li>
  <li>Property: PNPDeviceID</li>
  </ul>
  
  <p>...returns a value of <code>USB\VID_10C4&amp;PID_EA60\0001</code>.  This same value can be found by going to the appropriate entry in Device Manager -> Properties -> Details tab and selecting Device Instance Id.</p>
  
  <p>My question is, what does the <code>\0001</code> signify?  Or, can I expect my device to have a device ID of <code>USB\VID_10C4&amp;PID_EA60\0001</code> when plugged into any Windows system?  Thanks.</p>