Epson EXPRESSION 1640XL User Manual page 113

Once EPSON TWAIN Pro is installed on Windows 2000 or 98, the
Scanners and Cameras icon appears in the Control Panel, and
your scanner is listed in a Scanners and Cameras Properties
dialog box similar to the one below.
5
Assigning an application to the Start button
After you install applications that support "Scanner events", such
as PageManager for EPSON, you need to select one of those
applications for scanner events.
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If you want to use your scanner's Start button with
PageManager for EPSON as the supporting application, follow
the steps below.
5-13
Using the Start Button