Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Eric A. Bier , Steven Freeman, MMM: a user interface architecture for shared editors on a single screen, Proceedings of the 4th annual ACM symposium on User interface software and technology, p.79-86, November 11-13, 1991, Hilton Head, South Carolina, United States  [doi>10.1145/120782.120791]
	2	Bolt, R.A. The human interface. Lifetime Learning Publications, Belmont, California, 1984.
	3	Conklin, J.A survey of hypertext. MCC Technical Report No. STP-356-86, Rev. 2, Dec., 1987.
	4	Mary Elwart-Keys , David Halonen , Marjorie Horton , Robert Kass , Paul Scott, User interface requirements for face to face groupware, Proceedings of the SIGCHI conference on Human factors in computing systems: Empowering people, p.295-301, April 01-05, 1990, Seattle, Washington, United States  [doi>10.1145/97243.97299]
	5	Steven Feiner , Ari Shamash, Hybrid user interfaces: breeding virtually bigger interfaces for physically smaller computers, Proceedings of the 4th annual ACM symposium on User interface software and technology, p.9-17, November 11-13, 1991, Hilton Head, South Carolina, United States  [doi>10.1145/120782.120783]
	6	G. W. Furnas, Generalized fisheye views, Proceedings of the SIGCHI conference on Human factors in computing systems, p.16-23, April 13-17, 1986, Boston, Massachusetts, United States
	7	Hiroshi Ishii , Naomi Miyake, Toward an open shared workspace: computer and video fusion approach of TeamWorkStation, Communications of the ACM, v.34 n.12, p.37-50, Dec. 1991  [doi>10.1145/125319.125321]
	8	J. Chris Lauwers , Keith A. Lantz, Collaboration awareness in support of collaboration transparency: requirements for the next generation of shared window systems, Proceedings of the SIGCHI conference on Human factors in computing systems: Empowering people, p.303-311, April 01-05, 1990, Seattle, Washington, United States  [doi>10.1145/97243.97301]
	9	Jock D. Mackinlay , George G. Robertson , Stuart K. Card, The perspective wall: detail and context smoothly integrated, Proceedings of the SIGCHI conference on Human factors in computing systems: Reaching through technology, p.173-176, April 27-May 02, 1991, New Orleans, Louisiana, United States  [doi>10.1145/108844.108870]
	10	Ottino, C. User interface in the 1990's. ISA'92 (Houston, Texas, October), Instrumentation Society of America, 1992, 659-700.
	11	Sheridan, T.B. Supervisory control of remote manipulators, vehicles and dynamic processes: Experiments in command and display aiding. Advances in Man-Machine Research, 1, JAI Press Inc., London, England, 1984, 49-137.
	12	M. Stefik , D. G. Bobrow , G. Foster , S. Lanning , D. Tatar, WYSIWIS revised: early experiences with multiuser interfaces, ACM Transactions on Information Systems (TOIS), v.5 n.2, p.147-167, April 1987  [doi>10.1145/27636.28056]
	13	Nichole Yankelovich , Bernard J. Haan , Norman K. Meyrowitz , Steven M. Drucker, Intermedia: The Concept and the Construction of a Seamless Information Environment, Computer, v.21 n.1, p.81-83, 90-96, January 1988  [doi>10.1109/2.222120 ]

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