From the Wizard's link above:
"Many people have asked me what I mean by queen/6/4, wondering for example whether queen/7/3 is greater than queen/6/4. In any poker based game hands are scored first according to the highest card, then the second, and then the third, and so on if there are more. So a queen/7/3 would beat queen/6/4. The queens tie so the second highest cards are used to break the tie, and a 7 beats a 6. The third card does not matter in this case because the hand was resolved by the second card."
For instance, you would play a Q65, Q72 and K32 but fold a Q63, Q54 or J98 (assuming they are not flushes).
-Sonny-