Transfer is an ERC-20 method that allows accounts to send tokens to other Ethereum addresses. A aToken transfer will fail if the account has entered that aToken market and the transfer would have put the account into a state of negative liquidity.
AErc20 / CEther
function transfer(address recipient, uint256 amount) returns (bool)
recipient: The transfer recipient address.
amount: The amount of aTokens to transfer.
RETURN: Returns a boolean value indicating whether or not the operation succeeded.