Platform SDK: Performance Monitoring

Windows NT 4.0 Performance Monitoring

The following diagram illustrates the performance-monitoring architecture in Windows NT 4.0

The Windows NT Performance Monitor and custom application B use the registry interface to obtain counter information. Custom application A uses the PDH interface to obtain counter information. PDH in turn uses the registry interface. The extension DLLs expose the Open, Collect, and Close functions. For more information, see Creating the Performance Extension DLL.