If you know the path to a WMI instance, you can access it directly by converting the WMI path to a WMI object:
[wmi]'Win32_Service.Name="W32Time"'
[wmi]'Win32_Logicaldisk="C:"'
[wmi]'Win32_Logicaldisk="C:"'
You can also specify the full WMI path, including a machine name to access WMI objects on remote systems (provided you have sufficient access rights):
[wmi]'\\SERVER5\root\cimv2:Win32_Service.Name="W32Time"'
