Connecting two Linux PC's via LAN card

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http://www.linuxforums.org – I need a detailed description(step1.,step2....). I'd like to play some Linux games over LAN cards, and/or to share docs/files between two Ubuntu Karmics, off course via LAN cables. How to do that? Please write something only, if you've already done that. Thanks in advance! (HowTos)