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Код

        [System.Runtime.InteropServices.DllImport("Kernel32.dll", EntryPoint = "RtlMoveMemory", SetLastError = false)]
        static extern void MoveMemory(UInt16[] dest, UInt16[] src, int size);

        //For use with WM_COPYDATA and COPYDATASTRUCT
        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(int hWnd, int Msg, int wParam, ref COPYDATASTRUCT lParam);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        static extern int FindWindow (string lclassName, string windowTitle);
    
        public const int WM_COPYDATA = 0x4A;

        [StructLayout(LayoutKind.Sequential)]
        public struct COPYDATASTRUCT
        {
            public int dwData;
            public int cbData;
            public UInt16[] lpData;
        }
        
        COPYDATASTRUCT MyCDS = new COPYDATASTRUCT();
        public UInt16[] s2 = new UInt16[1024];

        //Send message
        public void Send_WM()
        {
            MoveMemory(s2,GlobalVars.all_gpt, 2*GlobalVars.tr_adr_q); //Fill tramsmit buffer
        // Fill the COPYDATA structure
        MyCDS.dwData = 1;          // function identifier
            MyCDS.cbData = s2.Length;
        MyCDS.lpData = s2;           // data structure
                 
        int pCalc;
            pCalc = FindWindow(null, "RECWindow");
        if(pCalc == 0){
                    MessageBox.Show("Can't send WM_COPYDATA");
                      }
                     else{
                                         pCalc = SendMessage(pCalc, WM_COPYDATA, 0, ref MyCDS);
                                    }

        }//Send_WM()