DNS administration in PowerShell, including tasks like creating zones and adding Host (A) records, can be performed using the WMI interface. Full documentation for the interface is available from Microsoft in the DNS WMI Provider Reference.
Group Policy will, by default, only set the desktop wallpaper using Active Desktop. It is also possible to set the wallpaper using the logon script, or using a custom Group Policy template.
Occasionally it can be useful to know how to retrieve the parent, or OU holding an object, from Active Directory.
Perhaps the easiest way to do this is using the Parent property.