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Leonardo: The TWAINIsDSMOpen function

The function TWAINIsDSMOpen returns TRUE if a TWAIN data source is found open on the system. The application should not call TWAINAquire or TWAINSelectDSe functions until the function returns FALSE. Any related interface components should be disabled until this function returns FALSE.

BOOL FAR PASCAL TWAINIsDSMOpen(
HTWAINACCESS	hta);

hta Handle to TWAIN memory created by TWAINInitialize