## Desktop Units (DTUs)

Various models of Sun Ray DTUs are available, differing primarily with respect to size, type, and supported resolution of the connected screen. However, all DTUs include a smart card reader, a keyboard, and a mouse.

Each DTU has a unique identifier, typically the Ethernet MAC address such as 040020f94f8a that is also printed on the chassis. Whenever a DTU connects for the first time to a Sun Ray server, it is automatically registered in the Sun Ray data store. (You can add a new DTU to the data store manually if you want to register any information before the first connection time.) It is also possible to store the DTU's location or other information that might help you to manage the DTUs in your organization.

The Desktop Units tab lists all the registered DTUs (similar to the `utdesktop` command). You can also search for specific DTUs by entering a search string that includes parts of either the identifier, location, or other information for the DTU. The Search menu allows you to limit the scope of the search further: you can display DTUs that are currently connected to a server, or search for specifically configured DTUs, such as token readers or multihead groups.