How to do it...

The steps for the recipe are as follows:

1. Create a WSUS computer target group for the Domain Controllers:

      $WSUSServer = Get-WsusServer
      $WSUSServer.CreateComputerTargetGroup('Domain Controllers')

1. Add a computer to the new computer target group:

      Get-WsusComputer -NameIncludes DC1 |
      Add-WsusComputer -TargetGroupName 'Domain Controllers'

1. List the clients in the computer target group:

      $DCGroup = $WSUSServer.GetComputerTargetGroups() |
      Where-Object -Property Name -eq 'Domain Controllers'
       Get-WsusComputer |
      Where-Object -Property ComputerTargetGroupIDs 
        -Contains $DCGroup.Id