It is a type of communication between two or more people who share computer data in real time. The data can include screen, documents, graphics, drawings and applications that can be manipulated by participants.
IDC projected over 9 billion minutes of voice traffic to travel over worldwide packet networks in 2000, exceeding 135 billion minutes in 2004. Service revenue is projected at 1.6 billion in 2000 and 18.7 billion in 2004.