NDI_ADDPROPPAGES lpnapp = (LPNDIADDPROPPAGES)lParam; // pointer to ADDPROPPAGES
The NDI_PROPERTIES message is sent to display the properties dialog box for the driver.
lpnapp
Value of lParam. Provides callback function information for adding a property sheet.
The message handler should fill out a PROPSHEETPAGE structure (psp) and pass it back as
(*lpnapp->lpfnAddNdiPropPage)(&psp,lpnapp->lParam,FALSE);
The last Boolean parameter specifies whether you want this page to be the initial page displayed on the property sheet.