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Use OpenPrinter procedure for getting printer handle and PrinterProperties procedure for opening printer properties window.
Don't forget include WinSpool and Printers in uses chapter.

uses WinSpool, Printers;
... 
procedure TForm1.Button1Click(Sender: TObject);
var
  MyPrinter, MyDriver, MyPort: array[0..100] of Char;
  PrinterHandle, DevMode: THandle;
begin
  Printer.GetPrinter(MyPrinter, MyDriver, MyPort, DevMode);
  OpenPrinter(MyPrinter, PrinterHandle, nil);
  PrinterProperties(Form1.Handle, PrinterHandle);
end;

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Win32 programmer's reference

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