INT_PTR CALLBACK HelpPageWndProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
/* DirectDraw tests */
-VOID DDTests();
+VOID DDTests(VOID);
/* Direct3D tests */
-VOID D3DTests();
+VOID D3DTests(VOID);
/* DirectSound initialization */
void InitializeDirectSoundPage(PDXDIAG_CONTEXT pContext);