Querying the Status of Optional Features
In Windows 7, WMI implemented the Win32_OptionalFeature class. This class retrieves the status of the optional features that are present on a computer.
You can use Windows PowerShell cmdlets to query the status of optional features. All of the examples in this topic use the Get-WmiObject cmdlet. For more information, see Get-WmiObject.
To retrieve all instances of optional features present on a computer
To query for an optional feature by specifying the feature name
Get-WmiObject -query "select * from Win32_OptionalFeature where name = 'TelnetClient'"Note The name property is case-sensitive.
To query for optional features by specifying the install state
Get-WmiObject -query "select * from win32_optionalfeature where installstate= 1"
For more information about the possible values for the InstallState property, see Win32_OptionalFeature.