internal static extern bool OpenProcessToken(IntPtr h, int acc, ref IntPtr

        retVal = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok);

          if (NativeMethods.OpenProcessToken(currentProcess, NativeMethods.TOKEN_ADJUST_PRIVILEGES | NativeMethods.TOKEN_QUERY, out tokenHandle))

                                 "OpenProcessToken failed. CurrentProcess: {0}",

      internal static extern bool OpenProcessToken(IntPtr processHandle,

    Private Function OpenProcessToken( _

        If Not OpenProcessToken(hProc, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, hToken) Then

             "OpenProcessToken failed with error " & lastWin32Error.ToString & ".")

static extern bool OpenProcessToken(IntPtr ProcessHandle,

Private Function OpenProcessToken( _

Declare Function OpenProcessToken Lib "advapi32.dll" ( _

    Source: Link to ''http://groups.google.com/group/microsoft.public.dotnet.general/browse_thread/thread/5742d50ec2e9f798/c702b8d7771f9016lnk=st&q=OpenProcessToken+0x00020000&rnum=1&hl=en#c702b8d7771f9016''

    public static extern bool OpenProcessToken(IntPtr ProcessHandle, UInt32 DesiredAccess, out IntPtr TokenHandle);

        if (!OpenProcessToken(processHandle, TOKEN_READ, out tokenHandle))

    public const int CO_E_FAILEDTOOPENPROCESSTOKEN = unchecked((int)0x8001013C);

    Public Const CO_E_FAILEDTOOPENPROCESSTOKEN As Integer = CInt(&H8001013cUI)

    /// Required to retrieve certain information about a process, such as its token, exit code, and priority class (see OpenProcessToken).

Used with OpenProcess.

in Token for the user, which is returned by the LogonUser, CreateRestrictedToken, DuplicateToken, OpenProcessToken, or OpenThreadToken function. The token must have TOKEN_QUERY and TOKEN_IMPERSONATE and TOKEN_DUPLICATE access. For more information, see Access Rights for Access-Token Objects.

IntPtr pic = OpenProcess(NativeMethods.ProcessAccessFlags.All, true, (int)pid);

   internal static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);

        IntPtr ptrProcess = OpenProcess(QueryLimitedInformation, false, iPID);

public static extern IntPtr OpenProcess(

public static IntPtr OpenProcess(Process proc, ProcessAccessFlags flags)

     return OpenProcess(flags, false, proc.Id);

Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As ProcessAccessFlags, bInheritHandle As Boolean, processId As UInt32) As IntPtr

IntPtr handle = OpenProcess(ProcessAccess.QueryLimitedInformation, false, process.Id);

See also PROCESS_BASIC_INFORMATION, PROCESSINFOCLASS, OpenProcess, CloseHandle.

        IntPtr hProc = OpenProcess(0x001F0FFF, false, Process.GetCurrentProcess().Id);

        IntPtr hProc = OpenProcess((ProcessAccessFlags)0x001F0FFF, false, Process.GetCurrentProcess().Id);

See http://www.pinvoke.net/default.aspx/kernel32/OpenProcess.html for the OpenProcess API.

    private static extern IntPtr OpenProcess(

        hProcess = StatusBar.OpenProcess(ProcessAccessTypes.PROCESS_ALL_ACCESS, false, this.OwningPID);

    IntPtr process = OpenProcess(ProcessAccessFlags.VMOperation | ProcessAccessFlags.VMRead |

    static extern IntPtr OpenProcess(ProcessAccessFlags dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, uint dwProcessId);

        static extern bool OpenProcessToken(

            if (OpenProcessToken(pId, TOKEN_QUERY, out hToken)) {

        public const int CO_E_FAILEDTOOPENPROCESSTOKEN = (int)(0x8001013C - 0x100000000);