Hi Loic,
Please see bellow scenario.
User Click on Scan button a TWAIN Interface gets invoked, and scans the documents from ADF/Platted Glass.
Now, if user wants that after scanning few docs from ADF tray, untill and unless they close TWAIN Interface, the interface should not gets close automatically, but allowing user to scan more documents and than once user close TWAIN interface mannually than only the interface should get close and give resulting files to respctive format supplied.
Please advice
-Thanks,
Viral

