code: public void setAdditionalInfo(String key, Object value) {
  
          if (key == null) {
              throw new CmsIllegalArgumentException(
                  Messages.get().container(Messages.ERR_USER_ADDINFO_KEY_NULL_1, getFullName()));
          }
          m_additionalInfo.put(key, value);
      }
docs: Stores a value in this users "additional information" storage map with the given access key.<p>
  
  @param key the key to store the value under
  @param value the value to store in the users "additional information" storage map
  
  @see #getAdditionalInfo()