iChat video conference from any G4

According to Apple, you need to meet some very specific requirements to either run or participate in a multi-participant video conference via iChat AV 3. Specifically, a dual 1GHz G4 or any G5-based Mac is needed to initiate a 4-person video conference, and either a 1GHz G4-, dual 800mhz G4-, or G5-based Mac is required to participate in a multi-party video conference. With Powerboost, you can change either of those requirements to "any G4." From the website:

"Harness and focus the power of your G4 processor to bring your family and friends together. Invite up to 10 iChat users to an audio conference. Host a 3-way or 4-way video chat."  Sounds interesting, but they don't go into how this actually works, or just what it does (or how taxed your G4 processor will be). There is a 7 day demo available, and a single license will run you $8US.