code: public int getMaxConnections() throws GuacamoleException {
  
          // Pull default from environment if connection limit is unset
          Integer value = getModel().getMaxConnections();
          if (value == null)
              return environment.getDefaultMaxGroupConnections();
  
          // Otherwise use defined value
          return value;
  
      }
docs: Returns the maximum number of connections that should be allowed to this
  connection group overall. If no limit applies, zero is returned.
  
  @return
  The maximum number of connections that should be allowed to this
  connection group overall, or zero if no limit applies.
  
  @throws GuacamoleException
  If an error occurs while parsing the concurrency limit properties
  specified within guacamole.properties.