A full description of RUCT is available here, and the tool can be downloaded here.
Below is a summary of what the tool can do:
1. Easily Query Important DNS Records used by Microsoft Lync Server and OCS.
DNS queries for the following Lync and OCS records are issued with one-click:
2. Test Network Availability.
3. Certificate Retrieval, Installation, and Export.
4. Easily Retrieve Important Client-Side Troubleshooting Information.