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<p>Computer network research has recently focused on the feasibility of running mobile code on the intermediate nodes that forward packets through a network. A network that exploits mobile code in this way is called an active network because the network's packet delivery service is programmable, rather than fixed. Active networking is just one example of a class of systems that exploit liquid software--low-level, communication-oriented code that easily flows from machine to machine. This article describes a Java-based platform for liquid software, called Joust, that is specifically designed to support low-level, communication-oriented systems and to avoid the limitations of general- purpose OSs. The authors contrast the platform requirements for communication- oriented liquid software with those of computation-oriented software, identify the limitations of current platforms, and outline the benefits of Joust. They also offer an overview of Scout (the underlying OS upon which Joust is built), its runtime system, and its just-in-time (JIT) compiler.</p>

B. Montz et al., "Joust: A Platform for Liquid Software," in Computer, vol. 32, no. , pp. 50-56, 1999.
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