ClientLauncher

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Diagnostics;
using System.Net;
using System.Threading;
using System.IO;
using System.Runtime.InteropServices;

namespace NexusClient
{
    public struct PROCESS_INFORMATION
    {
        public IntPtr hProcess;
        public IntPtr hThread;
        public uint dwProcessId;
        public uint dwThreadId;
    }

    public struct STARTUPINFO
    {
        public uint cb;
        public string lpReserved;
        public string lpDesktop;
        public string lpTitle;
        public uint dwX;
        public uint dwY;
        public uint dwXSize;
        public uint dwYSize;
        public uint dwXCountChars;
        public uint dwYCountChars;
        public uint dwFillAttribute;
        public uint dwFlags;
        public short wShowWindow;
        public short cbReserved2;
        public IntPtr lpReserved2;
        public IntPtr hStdInput;
        public IntPtr hStdOutput;
        public IntPtr hStdError;
    }

    public struct SECURITY_ATTRIBUTES
    {
        public int length;
        public IntPtr lpSecurityDescriptor;
        public bool bInheritHandle;
    }

    class Program
    {
        [DllImport("kernel32.dll")]
        static extern bool CreateProcess(
            string lpApplicationName,
            string lpCommandLine,
            IntPtr lpProcessAttributes,
            IntPtr lpThreadAttributes,
            bool bInheritHandles,
            uint dwCreationFlags,
            IntPtr lpEnvironment,
            string lpCurrentDirectory,
            ref STARTUPINFO lpStartupInfo,
            out PROCESS_INFORMATION lpProcessInformation
        );

        static void Main(string[] args)
        {
            Console.WriteLine("Type in your host name : ");
            string auth = Console.ReadLine();

            STARTUPINFO si = new STARTUPINFO();
            PROCESS_INFORMATION pi = new PROCESS_INFORMATION();

            CreateProcess(
                "WildStar64.exe",
                "/auth " + auth + " /authNc " + auth + " /lang en /patcher " + auth + " /SettingsKey WildStar /realmDataCenterId 9",
            IntPtr.Zero, IntPtr.Zero, false, 0, IntPtr.Zero, null, ref si, out pi);
        }
    }
}