code: public static IDBAccess createDBAccess(DBType dbType, Properties properties,
  			String userId, String password) {
  		return createDBAccess(dbType, properties, userId, password, null);
  	}
docs: create an IDBAccess (an accessor) for a specific database,
  supports authentication.
  @param dbType the type of database to access. Can be
  <br/>DBType.REMOTE or DBType.EMBEDDED or DBType.IN_MEMORY
  @param properties to configure the database connection.
  <br/>The appropriate database access class will pick the properties it needs.
  <br/>See also: DBProperties interface for required and optional properties.
  @param userId
  @param password
  @return an instance of IDBAccess