What is the function of the pseudo tty lines in /etc/ttys? I noticed that each of ttyp* has a line for it in there,
but for ttyq/r/s, only 0-9 and a-f. Still, sshd and other software use for example ttyqg. While experimenting with
this, I got a situation when running 'w' didn't show the user running it on a terminal not listed in /etc/ttys. Is
there a reason why it doesn't include all the possible pseudo ttys by default?