APIs:

SendInput API ( it can take place of keybd_event, and mouse_event)

  http://msdn.microsoft.com/en-us/library/ms961447.aspx

Mouse Input:

  http://msdn.microsoft.com/en-us/library/ms931454.aspx

keybd_event API:

  http://msdn.microsoft.com/en-us/library/aa453245.aspx

Virtual Key code:

  http://msdn.microsoft.com/en-us/library/ms927178.aspx

Reference web page:

1. http://www.armce.com/bbs/archiver/tid-195.html

2. http://www.cnblogs.com/iVincentFeng/archive/2010/04/20/KeyboardInputSimulation_SendMessage_keybd_event_PostKeybdMessage.html

3. http://www.cnblogs.com/edobnet/archive/2004/06/09/14334.aspx

4. http://topic.csdn.net/t/20040626/16/3125079.html

Samples:

// work in Windows Mobile/Windows/CE

void MouseClickAt(int g_x,int g_y)
{
        tagINPUT Inputs[2];

        int dx = g_x * 65535 / 800;  //把实际坐标换算成为绝对坐标，0-65535
        int dy = g_y * 65535 / 600;
       
        Inputs[0].type = INPUT_MOUSE;
        Inputs[0].mi.dwFlags = MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTDOWN;
        Inputs[0].mi.dx = dx;
        Inputs[0].mi.dy = dy;
        Inputs[0].mi.mouseData = 0;
        Inputs[0].mi.time = 0;

        Inputs[1].type = INPUT_MOUSE;
        Inputs[1].mi.dwFlags = MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTUP;
        Inputs[1].mi.dx = dx;
        Inputs[1].mi.dy = dy;
        Inputs[1].mi.mouseData = 0;
        Inputs[1].mi.time = 0;

        SendInput(2,Inputs,sizeof(tagINPUT));
}

void MouseClickAt2(int g_x,int g_y) 

// g_x, g_y are in screen coordinate
{
                //直接执行设定
                SetCursorPos(g_x, g_y);
                mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
                mouse_event(MOUSEEVENTF_LEFTDOW, 0, 0, 0, 0);
}