boolean canUseProxy(SignetSubject proxyGrantor, Subsystem subsystem)
public boolean canUseProxy(SignetSubject proxyGrantor, Subsystem subsystem)
	boolean canUseProxy(SignetSubject proxyGrantor, Subsystem subsystem)	{		Set proxies = getFilteredProxySet(proxyGrantor, subsystem);		boolean retval = false;		for (Iterator proxiesIterator = proxies.iterator();					proxiesIterator.hasNext() && !retval;)			retval = ((Proxy)proxiesIterator.next()).canUse();		return (retval);	}