Printing particular variable of a session

[eluser]veledrom[/eluser]
Hi,

This is my session content:

Code:

Array
(
    [session_id] => b5bc906a59c653a28c6fb5ea39fe4ce1
    [ip_address] => 127.0.0.1
    [user_agent] => Mozilla/5.0 ...........
    [last_activity] => 1326457999
    [user_data] =>
    [step_one] => Array
        (
            [text_mem_number] => 1111111111
            [text_surname] => Mysurname
        )

How can I just echo text_surname without going through many steps?

Thanks in advance