This callback message allows the margin text to be supplied for each page. This callback indicates that a new page of output is about to be created. Within the scope of this callback, the host application is able to set margin text to new values for the current page. For this callback, the pCommandOrInfoData parameter points to a zero-based count of the page about to be created.
Must be either SCCERR_OK or SCCERR_NOTHANDLED