tim@tim-laptop:~$ ps aux | grep X
root      1395  7.8 15.9 766888 648096 tty7    Ss+  Jan14 127:33 /usr/bin/X :0 -nr -verbose -auth /var/run/gdm/auth-for-gdm-BsIH9B/database -nolisten tcp vt7
tim      12307  0.0  0.0   8960   868 pts/0    S+   15:12   0:00 grep --color=auto X
root     21743  0.0  1.2 158312 51948 tty8     Ss+  01:16   0:02 /usr/bin/X :1 -br -verbose -auth /var/run/gdm/auth-for-gdm-PgOjxW/database -nolisten tcp