How can I get two threads to run simultaneously in a single process?

[Igor Vartanov]

Any idea how this might be accomplished ?

See your modified sample attached.

			  case SPEI_VISEME :
			// Viseme was determined by synthesis engine. The high word of wParam is the duration, in milliseconds, 
			// of the current viseme. The low word is for the next viseme of type SPVISEMES. The high word of lParam 
			// is the viseme feature defined in SPVFEATURE. This value will be zero if the current viseme is not primary 
			// stress or emphasis. The low word of lParam is the current viseme being synthesized.
			// wmId    = LOWORD(wParam);
			// wmEvent = HIWORD(wParam);

				//_RPT1(0, "wmId = %d\n", wmId);
				//_RPT1(0, "wmEvent = %d\n", wmEvent);

                pVoice->GetStatus( &eventStatus, NULL );
				ULONG viseme;
				viseme = eventStatus.VisemeId;

				_RPT1(0, "viseme = %d\n", viseme);
				// now you know what viseme to render
				// animation goes here below
				// decide what bitmap to draw
				bmpIdx = (viseme > 11); // simple animation: 
				                        // consonants are above 11, 
				                        // vowels are up to, therefore, 
				                        // mouth4.bmp will go for vowels, 
				                        // and test.bmp for consonants

				// make your window to re-paint the sprite region
				InvalidateRect(hWnd, NULL /* in fact you need your sprite rect here*/, FALSE);
				  break;

              default:
                 break;
           }

         SpClearEvent( &eventItem );
         }
         break;

	case WM_CREATE:         
		// pre-load sprite images
		hBitmap[0] = (HBITMAP)LoadImage(hInst, L"mouth4.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);         
		hBitmap[1] = (HBITMAP)LoadImage(hInst, L"test.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);         
		break;    
	case WM_PAINT:         
		PAINTSTRUCT     ps;        
		HDC                     hdc;        
		BITMAP                  bitmap;        
		HDC                     hdcMem;         
		HGDIOBJ                 oldBitmap;          
		hdc = BeginPaint(hWnd, &ps);          
		hdcMem = CreateCompatibleDC(hdc);         
		oldBitmap = SelectObject(hdcMem, hBitmap[bmpIdx]);          
		GetObject(hBitmap[bmpIdx], sizeof(bitmap), &bitmap);         
		BitBlt(hdc, 0, 0, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);          
		SelectObject(hdcMem, oldBitmap);         
		DeleteDC(hdcMem);          
		EndPaint(hWnd, &ps);         
		break;