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As Internet usage proliferates, resource security becomes both more important and more complex. Contemporary users and systems are ill-equipped to deal with the complex security demands of a ubiquitous, insecure network. The YGuard Access Control Model, developed at Brigham Young University, employs set-based access control lists, XML, and a modular architecture to provide users with an intuitive, extensible, and efficient method of controlling access to system resources. The implementation of YGuard in XWeb, a research project designed to replace HTTP, demonstrates the power and flexibility of the model and its potential for use in diverse modern systems. This paper examines the effectiveness of the YGuard Access Control Model in solving many of the access control problems associated with the modern, networked computing environment.