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See the earlier mail from

a) use createpipe(), createprocess() is the only way I
know to get stderr. However CreatePipe() and ReadFile()
is a shaky piece of work on win 9x systems. There are
examples of doing this in MSDN.

b) afaik you cant. You can read from stdin OR write to 

c) writeto("|more");write("xxx");writeto();
demos the output event

> Okay, this has gottem me really far along my way.
> Now I have some further questions concerning 'piping'
> The sample code 'opens' the STDOUT of the external process as _INPUT
> a) how would I (also) connect STDERR as a filehandle to read from?
> b) how do I write to the STDIN of the above external process?
> h=readfrom("|command -arg")
> writeto(h) -- does this connect to STDIN of above pipe?
> What I'm basically after is controlling another commandline tool 
> (ispell, curl etc) from within a lua-script. It would also be important 
> to catch STDERR, of course.
> Thanks for all the help already,
> -Martin