You may never knew if public id or sometime calls as differential of primary id or calls as secondary id can be used as anti boot protection. With only few steps such as make them join room and then dis activated the secondary id into inactive mode, you will free from boot attack. even your id is being inactive you still can make voice chat and view webcam. for more detail how to make public iD or secondary id as anti boot , just follow the link.
Be sure, that you already have a knowledge using public id and multi id, because this trick need that special skill. You also must have public id and two or more yahoo id. Hope this will help you.