Paessler WMI Tester is a tool for quickly and easily testing the accessibility of WMI counters. "Windows Management Instrumentation" is the latest technology from Microsoft for monitoring and managing Windows based systems. WMI allows a process to read data for many Windows' configuration parameters as well as current system status values. Access can take place locally or remotely via a network connection.

WMI is based on COM and DCOM and is integrated in Windows 2000, XP, 2003, Vista and later. Add-ons are available for Windows 9x and NT4. Products like Paessler's PRTG Network Monitor make use of the WMI functionality to monitor computers in network environments.

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