typedef enum _PRL_MOUSE_BUTTON {
  PMB_NOBUTTON = 0,
  PMB_LEFT_BUTTON = 1<<0,
  PMB_RIGHT_BUTTON = 1<<1,
  PMB_MIDDLE_BUTTON = 1<<2,
  PMB_XBUTTON1 = 1<<3,
  PMB_XBUTTON2 = 1<<4,
  PMB_XBUTTON3 = 1<<5,
  PMB_XBUTTON4 = 1<<6,
  PMB_XBUTTON5 = 1<<7
} PRL_MOUSE_BUTTON;