In poker, a blind player would be seated next to the dealer. Upon dealing the cards the dealer would then look over to the player as he would expose cards and then whisper in his ear what the cards were. The player would then say whether they wanted to stand or fold.
If a player cannot bet the full amount it takes to call (or make the blind or straddle bet), they can bet all their remaining cash. The player is then tapped out. The player keeps playing but makes no more bets (and, in particular, cannot raise).