Method: LOCK
Method: UNLOCK
Method: GET_UGRP
Method: DELETE_UGRP
Method: UPDATE_DESCR
Method: REMOVE_UGRP
Method: GET_INSTANCE
Method: ADD_USER
Method: CREATE
Method: READ_MULTIPLE
Method: ADD_UGRP
Method: READ_SINGLE
Method: REMOVE_USER
Method: UG_READ_DATA
Method: CONSTRUCTOR