questions on WLM(Windows Live Messenger). i've noticed WLM has a Group feature. i tried creating one and i invited some of my friends jioned in. but if i want the others could also request for joining in and the owner(me) or the co-owners decide to appove the request or not ,how can i do that?  how can the others see the group and make an request?  does the group have a size limit?what the upper size? thanks!