NetDocuments is possible solution, and is found on the appExchange.  It is a fully functional document management service that allows instant and effortless retrieval of data via S-controls.  These S-controls appear as embedded views in the Salesforce interface.  The only thing that will appear in the window is relative data, based off of a background search done each time you click a specific record. 

 

It sounds more complicated than it really is.  In fact, log out of any Salesforce browsers and open a new one.  Log in with my demo account credentials and take a look at some individual records for accounts, contacts, etc.  This same concept can easily be replicated for Leads, or any other tab in Salesforce.

 

username: marriottmurdock@hotmail.com

password: demouser3

 

Once you see what it can do, you can sign up for a free trial at: http://www.netdocuments.com/TestDrive/default.aspx

 

Let me know if you want to know more.  www.netdocuments.com

 

Regards,

Marriott