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    _NET_WM_PID is set by the application: right, that does make more sense! But it's not the X11 protocol, it's the relatively recent FreeDesktop specification. Commented Jan 8, 2011 at 12:26
  • In the ssh case, as far as the X server is concerned, this is a local connection from the sshd process. Though _NET_WM_PID seems to be set to the remote PID and WM_CLIENT_MACHINE to the remote connection (tested with xterm). Commented Jan 8, 2011 at 12:26