I'd appreciate an explanation of the ?xdm? listing under the IDLE column (see below) after I ran the 'w' command in BASH. I recently used 'umask 0022' but reset it to 'umask 0000' I can't think this would have caused the ?xdm?, but as a total novice, I'd like some help.
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
harry :0 :0 10:48 ?xdm? 4:16 0.73s init --user
harry pts/3 :0 10:59 3.00s 0.19s 0.01s w