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    <p>This should do the trick for you...</p> <p>[code]</p> <pre><code>using System; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization.Formatters.Binary; using System.Runtime.InteropServices; using System.Diagnostics; namespace TestApp { public static class Messenger { public const uint WM_USER = 0x0400; public const int MyMessage = 0x00000001;; [DllImport("User32.dll")] private static extern int RegisterWindowMessage(string lpString); [DllImport("User32.dll", EntryPoint = "FindWindow")] internal static extern IntPtr FindWindow(String lpClassName, String lpWindowName); //For use with WM_COPYDATA and COPYDATASTRUCT [DllImport("User32.dll", EntryPoint = "SendMessage")] internal static extern int SendMessage(int hWnd, int Msg, int wParam, ref COPYDATASTRUCT lParam); //For use with WM_COPYDATA and COPYDATASTRUCT [DllImport("User32.dll", EntryPoint = "PostMessage")] internal static extern int PostMessage(int hWnd, int Msg, int wParam, ref COPYDATASTRUCT lParam); [DllImport("User32.dll", EntryPoint = "SendMessage")] internal static extern uint SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, int lParam); [DllImport("User32.dll", EntryPoint = "PostMessage")] internal static extern int PostMessage(int hWnd, int Msg, int wParam, int lParam); [DllImport("User32.dll", EntryPoint = "SetForegroundWindow")] internal static extern bool SetForegroundWindow(int hWnd); //Used for WM_COPYDATA for string messages public struct COPYDATASTRUCT { public IntPtr dwData; public int cbData; [MarshalAs(UnmanagedType.LPStr)] public string lpData; } internal static int sendWindowsStringMessage(int hWnd, int wParam, string msg) { int result = 0; if (hWnd &gt; 0) { byte[] sarr = System.Text.Encoding.Default.GetBytes(msg); int len = sarr.Length; COPYDATASTRUCT cds; cds.dwData = (IntPtr)100; cds.lpData = msg; cds.cbData = len + 1; result = SendMessage(hWnd, (int)WM_USER, wParam, ref cds); } return result; } internal static uint sendWindowsMessage(IntPtr hWnd, uint Msg, IntPtr wParam, int lParam) { uint result = 0; if (hWnd != IntPtr.Zero) { result = SendMessage(hWnd, Msg, wParam, lParam); } return result; } internal static IntPtr getWindowId(string className, string windowName) { return FindWindow(className, windowName); } } </code></pre> <p>}</p> <p>In your calling method:</p> <pre><code>uint result = 0; IntPtr hWnd = Messenger.getWindowId(null, "MyOtherApp-Window_Title"); result = Messenger.sendWindowsMessage(hWnd, Messenger.WM_USER, Handle, Messenger.MyMessage); </code></pre> <p>[/code]</p>
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