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I need to create a new process but so that it is a "child" of another process not the current process eg re-parent the new process. The following have got me almost there .NET : How to call CreateProcessAsUser() with STARTUPINFOEX from C# and .NET : How to PInvoke UpdateProcThreadAttribute and http://winprogger.com/launching-a-non-child-process/ using System; using System.Diagnostics; using System.IO; using System.Runtime.InteropServices; public class ProcessCreator { [DllImport("kernel32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool CreateProcess( string lpApplicationName, string lpCommandLine, ref SECURITY_ATTRIBUTES lpProcessAttributes, ref SECURITY_ATTRIBUTES lpThreadAttributes, bool bInheritHandles, uint dwCreationFlags, IntPtr lpEnvironment, string lpCurrentDirectory, [In] ref STARTUPINFOEX lpStartupInfo, out PROCESS_INFORMATION lpProcessInformation); [DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool UpdateProcThreadAttribute( out IntPtr lpAttributeList, uint dwFlags, IntPtr Attribute, IntPtr lpValue, IntPtr cbSize, IntPtr lpPreviousValue, IntPtr lpReturnSize); [DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool InitializeProcThreadAttributeList( out IntPtr lpAttributeList, int dwAttributeCount, int dwFlags, ref IntPtr lpSize); public static bool CreateProcess(int parentProcessId) { const uint EXTENDED_STARTUPINFO_PRESENT = 0x00080000; const int PROC_THREAD_ATTR

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