 
            This callback, if registered, will be called by ImageGear after the source has been enabled; it allows you to negotiate additional capabilities while Data Source is at State 5.
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typedef LONG (LPACCUAPI LPFNIG_TWAIN_CAP_SET_5)(
        LPVOID lpData
);
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| Name | Type | Description | 
|---|---|---|
| lpData | LPVOID | A far pointer to private data, as specified in your call to IG_TWAIN_CB_register() function. | 
Return 1 if you want to continue scanning; return 0 to cancel scanning.
This function does not process image pixels.