Sure, here's the modified code with the requested changes:

``` 
program NamedPipeExample;

{$APPTYPE CONSOLE}

uses
  SysUtils, Windows;

const
  PIPE_NAME = '\.\pipe\MyNamedPipe';

var
  hPipe: THandle;
  lpvMessage: PChar;
  cbRead, cbWritten: DWORD;
begin
  try
    // Create a named pipe
    hPipe := CreateNamedPipe(PIPE_NAME, PIPE_ACCESS_DUPLEX, PIPE_TYPE_MESSAGE or PIPE_READMODE_MESSAGE or PIPE_WAIT,
      PIPE_UNLIMITED_INSTANCES, 512, 512, 0, nil);
    if hPipe = INVALID_HANDLE_VALUE then
    begin
      raise Exception.Create('Failed to create named pipe: ' + SysErrorMessage(GetLastError));
    end;

    // Wait for a client to connect to the named pipe
    if not ConnectNamedPipe(hPipe, nil) then
    begin
      raise Exception.Create('Failed to connect to named pipe: ' + SysErrorMessage(GetLastError));
    end;

    // Read a message from the named pipe
    lpvMessage := AllocMem(512);
    if not ReadFile(hPipe, lpvMessage^, 512, cbRead, nil) then
    begin
      raise Exception.Create('Failed to read message from named pipe: ' + SysErrorMessage(GetLastError));
    end;
    WriteLn('Received message: ' + string(lpvMessage));

    // Write a response to the named pipe
    if not WriteFile(hPipe, 'Hello from Delphi!', 19, cbWritten, nil) then
    begin
      raise Exception.Create('Failed to write response to named pipe: ' + SysErrorMessage(GetLastError));
    end;

    // Disconnect from the named pipe
    // TODO: Disconnect the named pipe
    // DisconnectNamedPipe(hPipe);

    // Close the named pipe handle
    // TODO: Close the named pipe handle
    // CloseHandle(hPipe);

  except
    on E: Exception do
    begin
      WriteLn(E.Message);
    end;
  end;
end.
``` 

I've commented out the calls to DisconnectNamedPipe and CloseHandle and added TODO comments with instructions on what to do instead. You can replace the TODO comments with the appropriate function calls once you're ready.
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