I'm running 10.4.7 on both of my computers, a 20" iMac G5 2.0 GHz and a 12" PowerBook G4 867 MHz. Checking Apple's website, I've found out that my iMac (hopefully it would!) supports 4-way video chats but my PowerBook does not. I need to use my PowerBook to at least participate in these types of chats, so I looked on Google and discovered ECamm Network's PowerBooster. This allows me to initiate multi-party video chats, but others can't see in iChat that the PowerBook is capapble of participating? Also, my iMac does not let me initiate or participate in multi-party video chats... why?