Start a TWAIN Session
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Before a TWAIN application can open a Source, it is necessary for the application to communicate with the TWAIN Source Manager (transition from TWAIN State 2 to State 3). To do this, the DTWAIN_StartTwainSession function is called.
Normally, a DTWAIN application need not call DTWAIN_StartTwainSession except for the purposes of setting up a notification window and/or to specify a different TWAIN Source Manager DLL.
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