There is a Spotlight on SQL Server Enterprise Client tool that can be installed on each users workstation. This way you will not have to RDP into the same machine in order to use the product. Spotlight includes unlimited user licenses, meaning as many people as needed can have the client installed on their desktop.
When you install Spotlight using the standard installer (downloadable from support.quest.com for existing customers), it will ask you whether you want to install the Client or Diagnostic Server. In this case, since you already have a Diagnostic Server installed, you should only select the Client. When you launch Spotlight for the first time, it will ask you for the servername that has yor Diagnostic Server installed on it.
If you need any further assistance, please let me know.