Screens supports three different URL schemes. All three will prompt for a username and a password, if they are required and not specified in the URL. Screens complies with the RFC 2396 URL schemes specification.
screens://John's MacBook Pro
Use the vnc:// prefix to connect to a computer not included in your saved "screens" list.
Note: if no username or password is present in the URL, Screens will assume that the authentication method is VNC password. It is recommended to add a username (with or without a password) in the URL when connecting to a Mac as Screens will then use Mac User as the authentication method.
Screens treats both vnc:// and screens:// equivalently on macOS.
The ssh:// prefix requires the same parameters as the vnc:// prefix, but establishes a secure network connection for your Screens session.
On macOS, it is possible that URL schemes vnc:// and ssh:// may be reserved by the operating system. In those cases, it is recommended to use the Open Link functionality (File > Open Link... or ⌘O) in Screens instead of clicking on a link, which may open another system application instead.