This does the trick (Win2K), the strange thing is that without the pipe you don't need to call perl explicitly - as '.pl' is associated with perl.

And of course - Windows doesn't give a damn if the pipe is broken or not and outputs:

Writing line 1
Read_three got: This is line number 1
Writing line 2
Read_three got: This is line number 2
Writing line 3
Read_three got: This is line number 3
Writing line 4
Writing line 5
Writing line 6
Writing line 7
Writing line 8
Writing line 9
Writing line 10
Wrote 3 lines of text
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-- Hofmator