 
            This callback is called when a mark is modified.
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typedef AT_VOID (LPACCUAPI LPFNIG_ARTX_MODIFYMARK_NOTIFY)(
        HIG_ARTX_HANDLE hPage,
        HIG_ARTX_MARK hMark,
        AT_MODE nModifyReason,
        LPVOID lpClientData
);
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| Name | Type | Description | 
|---|---|---|
| hPage | HIG_ARTX_HANDLE | ArtX page where the mark is located. | 
| hMark | HIG_ARTX_MARK | ArtX mark that is modified. | 
| nModifyReason | AT_MODE | Modification reason; may be one of the enumIGArtXModifyReason values. | 
| lpClientData | LPVOID | Client data that has been passed to the IG_ARTX_register_callback function. | 
This function does not process image pixels.