security concerns with dwr

Hi,
 
 New to dwr and want to know when using
        <servlet>
                <servlet-name>dwr-invoker</servlet-name>
                <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
                <init-param>
                        <param-name>debug</param-name>
                        <param-value>true</param-value>
                </init-param>
        </servlet>

        <servlet-mapping>
                <servlet-name>dwr-invoker</servlet-name>
                <url-pattern>/dwr/*</url-pattern>
        </servlet-mapping>
  why it is called "dwr-invoker". Does it has any relation to invoker servlets.
  &
  What are the security concerns while using dwr

Thanks