If we understand correctly your particular scenario, you want to use the report to "post" some kind of "commands" for your application that are not valid from outside the application. Although we're not familiar with your application we would suggest extracting these actions from the reports to the application. This way the reports will contain only the relevant information and will be really portable - that is you can export them to PDF or Excel and can open them outside your application.
To answer your question directly, you can accomplish such functionality by utilizing Hyperlink Action
with a similar Target Url e.g.:
= "http://www.yourdomain.com/radwindow.aspx?MyKey=" + ReportItem.Value
where ReportItem.Value would get you the cell value and you can get it within code like this:
string query = (string)Request.QueryString["MyKey"];
the Telerik team
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