Orca uses BRLTTY for Braille support. BRLTTY is used to access the text mode console content. On a typical Braille-enabled installation of Oracle Solaris, BRLTTY is already running and provides access to text consoles. When Orca starts, it connects to BRLTTY. If you switch from a text console to your X Windows session, your Braille display automatically follows and displays the content that Orca is presenting to you.
Orca currently works best with BRLTTY v3.8 or greater and also works well with BRLTTY v3.7.2. This document provides information about using Orca with BRLTTY 3.8.