Once Ethereum makes the switch to proof of stake how will one choose to stake Ether? Will they have to use a special program or will Ether not in use be considered staked and be used to gain more Ether?
After moving to Casper POS, To become a validator (mine new ethers) you will need locking up an amount of your ethers (to be bonded) by sending them to the Casper contract. If i remember they will stay locked for 4 months.