[Microsoft] Microsoft´s NetMeeting, http://www.microsoft.com/netmeeting
[T.120] T.12o Real Time Data Conferencing ITU Standard - http://www.imtc.org
[IBM - Journal of Research & Development] Vol. 42, No. 2 - Multimedia Systems, http://www.research.ibm.com/journal/rd/422/bisdikian.html
A Primer on the T.120 Series Standard, http://www.lotus.com/products/sametime.nsf/standards/
[Internacional Telecomunication Union] - Telecomunication Standardisation Sector, http://www.itu.int/