please tell me can i use canon degital camera as a web cam if so how can i use it.
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Unless there is some software (drivers) for the device to work as a webcam, no you cant. Since mostdigital cameras will only appear as a hard drive (assuming they do appear at all), the most probable answer is "no".
most probably you cant . i not too aware of a digicam exporting the video signals directly to the computer .