The computers used for the competition are all Windows boxes (at least they have been in the past), and are likely to be running either Vista or Win 7. The major problem you’re going to have is adapting your app to use the LPP (Loebner Prize Protocol) as communications protocol. It’s a “one character at a time” kinda thing, and given the nature of your bot, may be a bit of a challenge to adapt to.
Take a look at http://www.loebner.net/Prizef/2010_Contest/Loebner_Prize_Rules_2010.html for the official rules, which also describes the LPP, and provides a link to the judging program used, which is written in PERL, to give you some ideas about how you might create an interface.
Hope this helps.