unanimous consent - A Senator may request unanimous consent on the floor to set aside a specified rule of procedure so as to expedite proceedings. If no Senator objects, the Senate permits the action, but if any one Senator objects, the request is rejected. Unanimous consent requests with only immediate effects are routinely granted, but ones affecting the floor schedule, the conditions of considering a bill or other business, or the rights of other Senators, are normally not offered, or a floor leader will object to it, until all Senators concerned have had an opportunity to inform the leaders that they find it acceptable.
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.