Checking on my lsof -i suggestion now that I'm at work...
I just set up a screen sharing session from my laptop to another
machine.
lsof -i on my laptop produced the following output:
AppleVNCS 19770 jon 5u IPv6 0x69d9b2c 0t0 TCP *:vnc-server
(LISTEN)
AppleVNCS 19770 jon 6u IPv6 0x69d85a8 0t0 TCP
dhc016942.med.harvard.edu:vnc-server->blur.med.harvard.edu:49152
(ESTABLISHED)
Screen 19773 jon 4u IPv4 0x77a6270 0t0 TCP
dhc016942.med.harvard.edu:64931->blur.med.harvard.edu:vnc-server
(ESTABLISHED)
I didn't have to run lsof as root.
After ending the screen sharing session on the remote computer, lsof -
i on my mac produces this output:
AppleVNCS 19770 jon 5u IPv6 0x69d9b2c 0t0 TCP *:vnc-server
(LISTEN)
The AppleVNCS 'ESTABLISHED' socket is gone, as is the 'Screen' process
and its socket, leaving just the screen sharing listening socket.
Apparently the screen-sharing processes run as whoever is logged in at
the console.
If you want to find out if there's an active VNC session in progress,
this appears to be a reasonable lead on how to do it, although it
won't tell you who's controlling the computer at a given time or let
you distinguish remote input from local input.
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