friend bool operator<(const NotifyInfo& a, const NotifyInfo& b) {return a._idx < b._idx;}
friend bool operator<(const NotifyIconIndex& a, const NotifyIconIndex& b) {return a._hWnd<b._hWnd || (a._hWnd==b._hWnd && a._uID<b._uID);}
	friend bool operator<(const NotifyInfo& a, const NotifyInfo& b)		{return a._idx < b._idx;}