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The majority of today's computing takes place on interactive systems
that use a Graphical User Interface (GUI). Performance of these
systems is unique in that "good performance" is a reflection of a
user's perception. In this paper, we explain why this unique
environment requires a new methodological aproach. We describe a
measurement/diagnostic tool currently under development and evaluate
the feasibility of implementing such a tool under Windows NT. We
then present several issues that must be resolved in order for
Windows NT to become a popular research platform for this type of
work.
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