Open the TWAIN Source
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Note: By default, DTWAIN automatically opens the Source once the Source has been selected, however there are cases where the Source must be opened explicitly by the application. See DTWAIN_OpenSource for more information on when the application must call DTWAIN_OpenSource explicitly.
After selecting the Source, the application should open the Source using DTWAIN_OpenSource. Opening the Source transitions TWAIN from State3 to State 4.
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