How do I create a folder that multiple computers on my network can access?

Basically, i want to transfer data between two computers on a network, a large ammount. I know my friend had somehow configured a folder that each computer could open and put files into, or take out. How do i configure this (I am running Mac OS X 10.4.10 (tiger) and the other computer is running mac os x 10.3.9

How do I create a folder that multiple computers on my network can access?virus protection software

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