re: Poker & Live Poker rules
OP - rules can actually vary a lot depending on which room you're playing in, whether it's a cash game or a tournament, and so on.
Here's a link to Robert's Rules of Poker (condensed just for hold 'em, the full version has other stuff for draw and stud games too): http://people.brandeis.edu/~poker/rules.pdf
Your poker room should provide a full set of rules, either in the room or on their website.
The standing up during a hand thing is usually before the hand starts, as discussed below - as in if you're not in your seat when the hand is initially dealt your hand will usually be killed.
Once you do
have a live hand you're allowed to stand up if you want to - though obviously if you actually leave the table, you'll be considered to have folded.
Originally Posted by 87shorts
ya you cant stand up unless your all in. also with the first card off the deck rule they have now if your not siting when they start dealing your hand will be mucked. if your playing cash games almost all of them your aloud to straddle which is 2x the bb the player to the left of the BB can put into the pot before the hand is dealt to be last to act pre-flop. also some tournaments will give you a 1 orbit penalty if you don't bet the nuts on the river. that's all I can think of off the top of my head.
That last one is only if you don't bet/raise the nuts when you're last to act
on the river. Whether or not you're allowed to straddle varies room by room and game by game, so it always pays to check.