NDI_VALIDATE
hwndParent = (HWND)wParam; // handle of parent dialog window
The NDI_VALIDATE message is sent when Setup sends the DIF_VALIDATECLASSDRIVERS to the network class installers. The driver installer should check that all properties are correctly set or have valid default values; if a required parameter is not known and cannot be defaulted, then the installer should prompt the user for the value.
This message has no parameters.
A driver installer may call NdiProperties during this message. A driver installer that handles this message must also call NdiDefProc to perform standard validation.