Q:

How to use Canon Powershot A3100 IS camera as a Webcam in Windows 7 PC?

I wonder if it is possible to use the Canon Powershot A3100 IS camera as a Webcam in Windows 7 PC. If that is the case, how can I proceed?
Are there some recommended techniques?

A:

No, this is not supported on any operating system.
I do not know of any recent camera to do that unfortunately.
PS: Some people have hacked Canon firmware to do things that are not supported.
Whether it is possible or not, I do not know, but you can check this to see.

