Creates a new process and its primary thread. Then the new process runs the specified executable file in the security context of the specified credentials (user, domain, and password). It can optionally load the user profile for a specified user.

The CreateProcessWithLogonW and CreateProcessWithTokenW functions are similar to the CreateProcessAsUser function, except that the caller does not need to call the LogonUser function to authenticate the user and get a token.

--------------------------------------------------

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;


namespace MainTest
{
    class ProcessUserLogonHelper
    {
        /// <summary>
        /// 在Main函数中调用该方法的的示例代码
        /// </summary>
        private void InvokeExample()
        {
            ProcessUserLogonHelper phelper = new ProcessUserLogonHelper();
            Process pro = phelper.CreateProcessWithUserToken(@"C:\Program Files\Internet Explorer\iexplore.exe", "bestreme.com", "chdwu", "************");
            pro.Start();
        }

        /// <summary>
        /// 使用指定帐户绑定进程
        /// </summary>
        /// <param name="appPath">进程的宿主程序</param>
        /// <param name="domain">指定帐户的域名</param>
        /// <param name="userName">指定帐户的用户名</param>
        /// <param name="password">指定帐户的密码</param>
        /// <returns>绑定了特定帐户的进程</returns>
        public Process CreateProcessWithUserToken(string appPath,string domain, string userName, string password)
        {
            Process pro = new Process();
            ProcessStartInfo processInfo = new ProcessStartInfo(appPath);
            processInfo.UseShellExecute = false;
            processInfo.UserName = userName;
            processInfo.Domain = domain;
            System.Security.SecureString psw = new System.Security.SecureString();
            foreach (char c in password.ToCharArray())
            {
                psw.AppendChar(c);
            }
            processInfo.Password = psw;
            processInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(appPath);
            pro.StartInfo = processInfo;
            return pro;
        }

        /// <summary>
        /// 使用指定帐户绑定进程
        /// </summary>
        /// <param name="appPath">进程的宿主程序</param>
        /// <param name="userName">指定本地帐户的用户名</param>
        /// <param name="password">指定帐户的密码</param>
        /// <returns>绑定了特定帐户的进程</returns>
        public Process CreateProcessWithUserToken(string appPath, string userName, string password)
        {
            return CreateProcessWithUserToken(appPath, "", userName, password);
        }
    }
}

---------------

            MainTest.ProcessUserLogonHelper cmd = new MainTest.ProcessUserLogonHelper();
            Process p = cmd.CreateProcessWithUserToken("C:\\Program Files\\Internet Explorer\\iexplore.exe", 
                "administrator", "clq1111");

            p.Start();

            if (p==null)
            {
                MessageBox.Show("error");
            }

http://www.cnblogs.com/-clq/archive/2012/01/19/2327333.html

CreateProcessWithLogonW（好像可以指定进程的上下文环境）