Reserved button usually means player went to find more money and wants seat back. No player indicates the seat is available to the next gambler. Missed blind means that a player wants to take a break, missed antes and does not have any part of special jackpots or other promotions. Overs means a player is in the seat while the owner of the seat takes a break. Orginal players chips are usually covered with plastic box and player plays "over" the chips. Dealer button indicates who the player dealer would be in the rotation when a house dealer deals all the hands.
1/2 K I have no clue.