code: @Deprecated
      @CheckForNull
      public Computer getComputer() {
          for( Computer c : Jenkins.getInstance().getComputers() )
              if(c.getChannel()==channel)
                  return c;
          return null;
      }
docs: If this {@link Launcher} is encapsulating an execution on a specific {@link Computer},
  return it.
  
  <p>
  Because of the way internal Hudson abstractions are set up (that is, {@link Launcher} only
  needs a {@link VirtualChannel} to do its job and isn't really required that the channel
  comes from an existing {@link Computer}), this method may not always the right {@link Computer} instance.
  
  @return
  {@code null} if this launcher is not created from a {@link Computer} object.
  @deprecated since 2008-11-16.
  See the javadoc for why this is inherently unreliable. If you are trying to
  figure out the current {@link Computer} from within a build, use
  {@link FilePath#toComputer()} or {@link Computer#currentComputer()}.