> Does anyone, by any chance, know where I can find a *free* 
> piece of software 
> that can simulate two COM ports connected with a null modem? 
> It needs to work under Win XP. 

A short time ago I asked for software that could simulate a COM port
over Ethernet. One of the software packages that was meantioned could do
that: create a virtiual null modem.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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