I just downloaded the new Yahoo messenger for Vista beta and I can’t figure out how to invite someone to view my webcam, nor can I figure out how to view someones webcam how do I do this?

I only IM with my husband and I know I can take pictures of him when he uses his webcam and I mine but I dont know how to do this. I use yahoo and windows live messenger. Any help is greatly appreciated, I want a new picture of him since I havent seen him in 8 months. Thanks.