> Well, I just tried the async grep idea with /b. The only problem (with 
> 7.3.434, so before any of the 'shellxquote' patches) is with the echo 
> statement in the command (which with /b is never displayed anyway). So 
> I retract my statement about redirection not working. Can we make the 
> help clearer? What exactly does that 'stdout and stderr' comment 
> actually mean?

This is "sub-shell". In unix meanings, \\.\NUL is /dev/null.

(ls > output.txt) 2>&1> /dev/null

As you know, ':!start' is imitation of 'start' command in cmd.exe. So I'm
thinking vim's behavor should be same as cmd's one.
If typing below in cmd.exe, it works correctly.

C:\>start /b cmd /c echo 1vim_free | cscope -dl -f cscope.out | 
C:\cygwin-1.7\bin\sed --regexp-extended -e "s/(\S+) (\S+) ([0-9]+)/\1:\3 \2 

I hope that vim should get same result. And I'm thinking :help is enough to 
understand behavior currently.

Thanks.

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