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IntPtr hglobal = Marshal.AllocHGlobal(1000);
IntPtr ptr = GlobalLock(hglobal);
// now use Marshal copy functions to copy the data to global memory
// send the handle to other process.
// you would need its window handle what could be retrieved by FindWindow
IntPtr uid = RegisterWindowMessage("MyWindowID");
SendMessage(hwndProc, uid, hglobal, 0);
// when SendMessage returned the other process has fetched the data
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