Internet Ranking Password:

To recieve your internet ranking password, first complete Time Attack, Survival, Force, or Training mode. Hold down square and triangle and press up+right (right diagonal) on the control pad. You can then submit it to Namco Japan's Tekken 4 webpage to see how you rank against the rest of the world.
Direct link: http://www.namco.co.jp/home/cs/ps2/tekken4/ranking/index.html