It will take parameters for number of days, weeks, months, or years that you want to go back in time. It will take that and pull all devices that have not logged into AD since that time and remove them from AD and SCCM. There is also a parameter for search base, which is the OU of AD that you want to look in. It includes all of the same help items as well.

SCCM 2603 Upgrade Planning: Risks and Prerequisites
Planning your Configuration Manager 2603 upgrade? See the prerequisites Microsoft won’t flag, the common risks admins hit, and post-upgrade checks that matter.