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.
Use the Get-AdSite cmdlet to display configuration information about one or more Active Directory sites.
If not, you can refer to the Microsoft documentation about the best way to this for your platform. To use the module, select Start -> Administrative Tools -> Active Directory Module for Windows Powershell . Or you can just use Import-Module ActiveDirectory in your normal PowerShell window.
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.