The following sites provide information on Windows Management Instrumentation (WMI):
http://www.msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/wmi_start_page.asp
http://www.microsoft.com/whdc/hwdev/driver/wmi/default.mspx
http://www.microsoft.public.wbem
http://www.microsoft.public.dotnet.framework.wmi