How do you use you Dell Inspirion 1545 webcam after installing another webcam?

After plugging in another webcam to your Dell Inspiron laptop how do you then go back to using your built in webcam?How do you use you Dell Inspirion 1545 webcam after installing another webcam?It depends on the application your using. MSN has an audio and video settings dialog on which there is a dropdown list with all the available web cams on it.