A parameterized report uses input values to complete report or data processing. With a parameterized report, you can vary the output of a report based on placeholder values that are set when the report runs. Parameters can be used to complete a query that selects report data, to filter the result set that the query returns, or to drive layout properties used for showing and hiding parts of a report. You can use parameters with linked reports by pairing a specific parameter with each linked report to change the outcome. For example, you can create a single regional sales report that shows the sales for all regions, and then use a parameter for each linked report to filter data for a particular region.
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1. Parameterized Reports, http://msdn.microsoft.com/en-us/library/aa256341(SQL.80).aspx , Date Accessed 2nd December 2008