Citrix Support is focused on ensuring Customer and Partner satisfaction with the support of our products. One of our initiatives is to increase the ability of our Partners and Customers to leverage self-service avenues for finding answers and resolving problems. A key area that the Support teams focus on is development of troubleshooting and health checking tools.

How often did you wish there was a way to change the GUID on a virtual desktop agent without manually going to the registry or running a repair on the VDA agent? Well Citrix Support team is pleased to provide you another useful tool to do that and more …
It is called the XenDesktop VDA farm Changer!

This tool can scan Active Directory to find available Farms, provide a dropdown list of the available farms along with the ability to change farm membership, displays current farm membership, displays VDA and/or ICA client version, provides an interface to all VDA system services along with service status, and provides other data points and frequently used shortcuts for VDA management.
You can download this tool here in http://support.citrix.com/article/CTX124379