code: public static void put(final String key, final String value) {
  		try {
  			systemRoot.put(fixKey(key), value);
  		} catch (final Exception e) {
  			System.err.print(e);
  		}
  	}
docs: Put.
  
  @param key   the key
  @param value the value
  @see java.util.prefs.Preferences#put(java.lang.String, java.lang.String)