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weird pipe behaviour!

I've noticed some really strange behaviour with pipes. Try this:

mkfifo wow
cat < wow &
cat < wow &
echo hi there > wow

If I run this in an rxvt, using tcsh, my window disappears after the
echo command! Works ok if you only run one cat.
My kernel is 2.2.12.

Can anyone explain?

Hamish Moffatt VK3SB. CCs of replies on mailing lists are welcome.

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