Wide area networking is the next evolutionary step toward distributed computing and many applications that were found useful in local area networks will show their presence in the wide area networks (WAN). The question is: Given today's typical WAN infrastructure, what are the effects of the presence of distributed applications in the WANs and what can be done to facilitate full deployment of such services across wide area network.; A simulation model for X window system distributed graphical applications in high energy physics and nuclear physics communities interacting across Energy Science wide area network (ESnet) is created to examine X service resource requirements and ESnet resource limitations. Through simulation analysis performance measures such as utilization, throughput, and more importantly delays for present traffic pattern on the ESnet network, and incremental introduction of X to the network is obtained followed by the load level at which the network becomes unstable.; Proposals for resource upgrade to T3 links and a service-based packet priority scheme at the network layer for improved performance and eventual wide spread deployment of X protocol through internets are outlined and examined through modeling analysis.
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