code: public static PdfAction createLaunch(String application, String parameters, String operation, String defaultDir) {
          return new PdfAction(application, parameters, operation, defaultDir);
      }
docs: Launches an application or a document.
  @param application the application to be launched or the document to be opened or printed.
  @param parameters (Windows-specific) A parameter string to be passed to the application.
  It can be <CODE>null</CODE>.
  @param operation (Windows-specific) the operation to perform: "open" - Open a document,
  "print" - Print a document.
  It can be <CODE>null</CODE>.
  @param defaultDir (Windows-specific) the default directory in standard DOS syntax.
  It can be <CODE>null</CODE>.
  @return a Launch action