Awareness is an understanding of the activities of others, which provides a context for your own activity. An awaress tool scaffolds awareness.
Kinds of tools
There are several kinds:
- WYSIWITYS: What you see is what I think you see" is a property that can help technology support realtime interaction between physically separated users. The WYSIWITYS property is a natural consequence of adhering to a physical world metaphor.
- WYSIWIS: What you see is what I see. This is more constrained symmetrical version of WYSIWITYS.
Randall B. Smith (1992), What you see is what I think you see, ACM SIGCUE Outlook,21 (3), 18-23 
M. Stefik, D. Bobrow, S. Lanning, and D. Tatar, WYSIWIS revised: Early experiences w1th mu1ti-user Interfaces. Proceedings of the Conference on Computer Supported Collaborative Work, Dec. 3- 5,1986, Austin Texas, pp 276-290.