code: private static boolean environmentPropertiesEnabled(Properties properties)
              throws GuacamoleException {
  
          final Boolean enabled = ENABLE_ENVIRONMENT_PROPERTIES.parseValue(
                  properties.getProperty(ENABLE_ENVIRONMENT_PROPERTIES.getName()));
  
          return enabled != null && enabled;
      }
docs: Checks for the presence of the {@link #ENABLE_ENVIRONMENT_PROPERTIES}
  property in the given properties collection.
  
  @param properties
  The properties collection to check.
  
  @return
  true if the property is present in the given properties collection
  and its parsed value is true
  
  @throws GuacamoleException If the value specified for the property
  cannot be successfully parsed as a Boolean