re: Poker & playing without a poker tracker...
That is what HUD stands for. And what it does is it shows you customizable information on the tabel screen like how often your opponents volountarily put money into the put, preflop raise, their 3bet percentages, how aggressive they are, etc... so it is nice for people who are playing a lot of gamesd at once that can't wuite keep track of everything that is going on at all of their tables.
And it does keep track of a your opponents hands and what they did for each of them, but it also does it for yourself as well. Therefore you can go back and look at how you played certain hands and what all of your stats are and such. It is kind of hard to explain it all without having you try it yourself. I would say just check it out and see if you like it.