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## Acknowledgments

Key infrastructure without which this project would not have been possible has been developed by: Michael McLennan of Bell Labs ([incr Tcl]/[incr Tk]), John Ousterhout of Scriptics Corporation (Tcl/Tk), and Mark L. Ulferts of DSC Communications Corp ([incr Widgets]). We also thank the reviewers for their careful reading and comments on this paper.

Tycho is part of the Ptolemy project, which is supported by the Defense Advanced Research Projects Agency (DARPA), the State of California MICRO program, and the following companies: The Alta Group of Cadence Design Systems, Hewlett Packard, Hitachi, Hughes Space and Communications, NEC, Philips, and Rockwell.

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