Bonjour conference

[sly sly]

Is it possible to have a "conference call" chat with multiple users at the same time using Bonjour? If so, how? If not, is there any other way to participate in a conference-chat on a local network only?
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Windows Live™ Contacts: Organize your contact list. 
http://windowslive.com/connect/post/marcusatmicrosoft.spaces.live.com-Blog-cns!503D1D86EBB2B53C!2285.entry?ocid=TXT_TAGLM_WL_UGC_Contacts_032009