My son used one for his dog when it was a puppy and I think he did it through Yahoo. I think this is the link to start with and go from there. At least it is one way to do it. I think though you had to have Yahoo Messenger installed to do it. I would just bring up my Yahoo Messenger, click on Danny's name and I think it would take me right to his webcam on Tex. I babysat that puppy via webcam for hours! I could talk to him and everything.
Webcam - Yahoo! Messenger