SharePoint 2007: The Definitive Guide
by James Pyles, Christopher M. Buechler, Bob Fox, Murray Gordon, Michael Lotter, Jason Medero, Nilesh Mehta, Joris Poelmans, Christopher Pragash, Piotr Prussak, Christopher J. Regan
Excel Services Web Access
Rather than have partners and customers download copies of spreadsheet data from your server, the Excel Services Web Access (EWA) Web Part allows a single copy of an Excel Workbook to exist on a secure server. The EWA service publishes spreadsheet data in your BI Report Center, enabling any authorized person to access this information using only a web browser.

Figure 15-3. Adding information to a KPI
Using EWA enhances the security of your critical business data in the following ways:
A single copy of the workbook is stored on a single secure server.
Information can be published to the Report Center site as Read-Only.
You can publish a snapshot of the workbook rather than the interactive version, preventing anyone from modifying data.
All calculations are performed on the server, cloaking the business logic from people viewing the data via the Report Center.
EWA technology uses Dynamic HyperText Markup Language (DHTML) and JavaScript to provide web access to .xslx- and .xslb-formatted data without requiring that ActiveX controls be loaded in the observer's browser. The EWA Web Part can connect to other Web Parts, such as Dashboards, or to other Web Part pages.
Data in an Excel workbook either can be stored directly in the workbook that resides on your secure server or can come from an external data source, such as a database or an Online Analytical Processing (
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