Use the Get-AdSite cmdlet to display configuration information about one or more Active Directory sites.
You can just type the Get-ADGroupMember cmdlet in a PowerShell window and you'll be prompted to enter the name of the group you want to use. Note that you must be logged in to Windows with a domain user account that has permission to read the group(s) you want to list.
In server manager, click Tools > Active Directory Users and Computers: Click the Find Objects button. The find drop down lets you choose between the type of Object you are looking for. The in drop down will let you change the OU or domain you are searching for.
The Get-ADComputer cmdlet gets a computer or performs a search to retrieve multiple computers. The Identity parameter specifies the Active Directory computer to retrieve. You can identify a computer by its distinguished name, GUID, security identifier (SID) or Security Accounts Manager (SAM) account name.