Cannot use two iSight cameras at the same time

I use an external display on my laptop. Close the lid and work on the external display. I connect an external iSight, and a message says that the camera is already in use?!
Can I not use two iSights at the same time?

Hello Webmaster
You can have two iSights connected at one time, but, as explained in Apple's iSight "Your camera is in use by another application" message, iSight can be used by one application at a time. (my emphasis) Check for any running applications, Login Items, or widgets that can use your iSight. (It is easy to forget widgets like Mirror in your Dashboard.)
Different apps select between multiple connected cameras in different ways. For instance, you use iChat > Preferences... > Video settings to select which camera to use, but iMovie 6 uses a drop-down menu as shown in this picture:
The suggestions in How to Troubleshoot iSight should help you determine whether one of your iSights is causing trouble. I suggest you test each one separately and without your external display or other peripherals to rule out possible conflicts like the one that user BombCreative reports in his post at http://discussions.apple.com/message.jspa?messageID=5868843#5868843
After you are certain that your iSights are working individually, test them when both are connected. After your system successfully passes these tests, you can add your external devices back one-by-one to be sure one of them is not causing the problem.
EZ Jim
PowerBook 1.67 GHz w/Mac OS X (10.4.11) G5 DP 1.8 w/Mac OS X (10.5.1) External iSight

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Cannot use two iSight cameras at the same time

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