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Accurate and efficient monitoring of dynamically changing environments is one of the most important requirements for ubiquitous network environments. To exploit these ubiquitous environments, we designed and implemented a monitoring system called MONETA that can obtain sensor data transmitted from wireless sensors to hub nodes in embedded equipment. MONETA adopts Web technology for the implementation of a simple but efficient user interface that allows an operator to visualize any of the processes, elements, or related information in a convenient graphic form. We developed MONETA using a kernel wrapper mechanism. This wrapper is a software module that enables us to monitor the state information of several embedded devices without any modification to the kernel. This wrapping method has allowed us to increase the portability of the monitoring system to other platforms and reduce the time required to write monitoring software modules.