Single wire multiswitch. Press and hold the info key, then click on more system info. If you have a swm setup, it will show there. Since you are asking about adding a client, I assume you have a Genie, which requires a swm setup.
While tooling around in the menus I found a "Add a Client" tab. Looked pretty straight forward. Think I will get a new client and try it myself. How hard can it be? Thanks for the info.