Given what I do for Macworld, I take a lot of screenshots. Sometimes I need to take those shots remotely -- for instance, to grab a screnshot of the login window, you must connect to a logged-out Mac via ssh, then use the screencapture command, as described in this older hint.
With 10.5, though, the rules have changed, as described in the man pages for screencapture:
To capture screen content while logged in via ssh, you must launch screencapture in the same mach bootstrap hierarchy as loginwindow:
PID=pid of loginwindow
sudo launchctl bsexec $PID screencapture [options]
So to take a screen capture, you need to first get the PID of the login...
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