1. ACM. ACM Symposium on User Interface Software and Technology, Altanta, GA, 1993.
2. M. Altenhofen, B. Neidecker-Lutz, and P. P. Tallet. Upgrading a window system for tutoring functions. In ARGOSI Workshop on Distributed Window Systems. EuroGraphics, EuroGraphics, December 1991.
3. ANSA. ANSA Reference Manual. APM Ltd., Cambridge, UK, 1989.
4. P.A. Appino, J.B. Lewis, L. Koved, D.T. Ling, D.A. Rabenhorst, and C.F. Codella. An architecture for virtual worlds. Presence, 1(1):1–17, Winter 1992.
5. François Armand . Give a Process To Your Drivers. Technical Report CS/TR-91–97, Chorus Systemès, 1991.