Ethernet wired connection using crossover cable

my desktop has windows xp
and my laptop has windows vista
i have a crossover cable

i want to connect this 2 pcs so i can share files....(basically i want to copy my 80GB HDD contents to my laptop)

which pc do i setup as the main pc?? i haven't used vista that much....so very unsure...

how do i configure each???

please some one help!
 
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