Mastering Windows PowerShell Scripting - Third Edition

WMI object paths

A WMI path is required to find classes associated with an instance. The WMI object path uniquely identifies a specific instance of a WMI class.

The object path is made up of a number of components:

<Namespace>:<ClassName>.<KeyName>=<Value> 

The namespace can be omitted if the class is under the default namespace, root\cimv2.

The KeyName for a given WMI class can be discovered in a number of ways. In the case of Win32_Process, the key name might be discovered by using any of the following methods.

It can be discovered by using the CIM cmdlets:

(Get-CimClass Win32_Process).CimClassProperties | 
    Where-Object { $_.Flags -band 'Key' } 

It can be discovered by using the MSDN website, which provides the descriptions of each property ...