code: @Nonnull
      public Process exec() throws IOException {
          List<String> commandWords = toCommandWords();
          ProcessBuilder builder = new ProcessBuilder(commandWords);
          // TODO: Use Redirect to send the I/O somewhere useful.
          QEmuCommandLineUtils.redirectIO(builder);
          return builder.start();
      }
docs: Executes this QEmuCommandLine and returns a new {@link Process}.