Sun Ray Software creates a device directory called IEEE802.MACID in the /tmp/SUNWut/units directory. This directory contains the MAC address for each client on the interconnect. The IEEE802.MACID directory for each client contains dev and devices directories. The Sun Ray dev directory contains a representation of the logical topology of the devices connected to the client. The Sun Ray devices directory contains a representation of the physical topology of some of the devices connected to the client.

Directories correspond to buses and hubs, and files correspond to ports. Hub directories are named according to the port on the upstream hub into which they are attached.