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DRMonitor is a system for monitoring usage of computing resources of networked heterogeneous (Linux and Windows NT's derived) personal computers. DRMonitor is aimed to serve resource-monitoring applications and to assist load-balancing policies by providing performance and load data about each monitored machine included in the system. Through a reduced set of primitives, applications can periodically receive updated information about system usage. The paper describes available primitives, discusses some internal aspects of the monitoring system, and presents monitoring results of a classroom with 10 personal computers.