For the purpose of this tutorial, let's say you have 2 group in Active Directory and you want each group to have access to certain applications. For example:
When you create the Delivery Controller, both Group1 and Group2 as well as Application1 and Application2 will be in your Delivery Controller. Follow these steps so that Group1 only receives Application1 and Group2 receives Application2.
Repeat these steps for Group2 and Application2.