Philips PCA646VC Installation Manual page 12

Defaults
If you like a particular setting for one application or light condition, and
another setting for a different one, you can use the Restore and Save
buttons to save and restore these preferred settings. Should you wish
to restore all standard settings, click on the Restore button under
Factory Defaults.
5.2.1.3 Capture Source
The third tab is 'Capture Source'.
Usually this setting has only one option when the USB PC Camera is
the only video source connected to your computer. However, if more
than one video source is connected to your system, then this is where
you switch between them.
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