In addition to the tty and graph devices, there are a few other entries in the dev directory.
Opening /dev/tty has the same effect it has always had. Opening /dev/tty is equivalent to opening the tty device that is the process's controlling terminal. We have added a new file, /dev/graphic, which is entirely analogous to /dev/tty. Opening /dev/graphic is equivalent to opening the graph device that corresponds to the process's controlling terminal.
Linux traditionally has several devices /dev/tty1, /dev/tty2, etc. When using GGI, one would normally create these devices and give them the same device numbers as /dev/display/head0/tty1, /dev/display/head0/tty2, etc.