This setting controls whether users can change the scan source on TWAIN scan formats. If users attempt to change the scan source after scanning a set of documents, the Select Source dialog box is displayed behind the Scan Acquisition Server window, making the application appear unresponsive.
Set one of the following values:
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Set to 0 to let users change the TWAIN scan source after scanning, but the Select Source dialog box will be displayed behind the Scan Acquisition Server window.
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Set to 1 to let users select a scan source only if one has not previously been specified for the selected TWAIN scan format. If a scan source has been specified, the Scan Acquisition Server will use that scan source, and the button for changing the scan source will be unavailable.