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## Abstract

We present the design of a AGNI - a Tcl 8.1 based Middleware for building reactive, extensible, reconfigurable distributed systems, based upon an abstraction we call Mobile Streams. Using our system, a distributed, event-driven application can be scripted from a single point of control and dynamically extended and re-configured while it is in execution. Our system is suitable for building a wide variety of applications; for example, distributed test, conferencing and control-oriented applications. We illustrate the use of our system by presenting example applications.