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This is intended to be a useful mode when you want to run an ssh agent in a terminal session with no X11 available. You just execute a command along the lines of eval $(pageant -T), and then Pageant will run in the background for the rest of that terminal session - and when the terminal session ends, so that Pageant loses its controlling tty, it will take that as the signal to shut down. So, no need to manually kill it, and unlike 'pageant --exec $SHELL', you can also do this half way through a session if you don't realise until later that you need an SSH agent, without losing any shell command history or other shell context that you've accumulated so far in the session. Unfortunately, I haven't been able to find any reliable way to actually implement this -T mode, short of having Pageant wake up at regular intervals and try to open /dev/tty to see if it's still there. I had hoped that I could arrange to reliably get SIGHUP, or select on /dev/tty for exceptional conditions, or some such, but nothing I've tried along those lines seems to work.