UINT SetTimer(
    HWND hWnd,              // handle of window for timer messages
    UINT nIDEvent,          // timer identifier
    UINT uElapse,           // time-out value
    TIMERPROC lpTimerFunc   // address of timer procedure );

The SetTimer function creates a timer with the specified time-out value. 

BOOL KillTimer(
    HWND hWnd,      // handle of window that installed timer
    UINT uIDEvent   // timer identifier
);

case WM_CREATE:
    SetTimer(hWnd, 1, 1000, NULL);
    SetTimer(hWnd, 2, 5000, NULL);
    SendMessage(hWnd, WM_TIMER, 1, 0);
    return 0;
    
case WM_TIMER:
    switch(wParam)
    {
        case 1:
            GetLocalTime(&st);
            wsprintf(sTime,TEXT("현재 시간 %d:%d:%d"),
                st.wHour, st.wMinute, st.wSecond);
            InvalidateRect(hWnd, NULL, TRUE);
            break;
        case 2:
            MessageBeep(0);
            break;
    }
    return 0;

static TCHAR str[128];

switch(iMessage)
{
    case WM_TIMER:
        KillTimer(hWnd, 1);
        lstrcpy(str,"");
        InvalidateRect(hWnd, NULL, TRUE);
        return 0;
        
    case WM_LBUTTONDOWN:
        lstrcpy(str,"왼쪽 버튼을 눌렀습니다.");
        InvalidateRect(hWnd, NULL, TRUE);
        SetTimer(hWnd, 1, 3000, NULL);
        return 0;
        
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        TextOut(hdc, 10,10, str, lstrlen(str));
        EndPaint(hWnd, &ps);
        return 0;
}