proxy voting - The practice of allowing a Senator to cast a vote in committee for an absent Senator. Senate Rule XXVI provides that proxies may not be voted when the absent Senator has not been informed of the matter on which he is being recorded and has not requested that he be so recorded.
Congressional Sessions lists all Congresses and corresponding years - from 1789, when the 1st Congress met, through the current Congress.
You can access legislative information, by bill number or key words, from the THOMAS Web site. Information from the present back to the 93rd Congress (1973) is available on THOMAS.
For information on the Senate, Congress, the legislative process and the federal government, the Virtual Reference Desk is a good place to begin.