The Delivery Controller is the component that distributes desktops, manages user access, and optimizes connections. A XenDesktop Site can have one or more controllers depending on the size of the deployment.
Before a desktop can be used, the Virtual Delivery Agent (VDA) must establish a connection with a Delivery Controller. The VDA finds a controller by checking the
ListOfDDCs registry key. The
ListOfDDCs registry key contains the DNS entries or IP addresses that point to the controllers for the XenDesktop Site. For load balancing, the VDA automatically distributes connections across all the controllers in the list.
ListOfSIDs registry key indicates which machine Security IDs ...