protected void readPort( PrintWriter out ){
    	out.println("<p>APP_INSTALL_ROOT - enter</p>");
    	try  
        {   
            AdminService adminService = AdminServiceFactory.getAdminService();   
            ObjectName queryName = new ObjectName( "WebSphere:*,type=AdminOperations" );   
            Set objs = adminService.queryNames( queryName, null );
            if ( !objs.isEmpty() )   
            {   
                ObjectName thisObj = (ObjectName)objs.iterator().next();   
                String opName = "expandVariable"; //expandVariable   
                String signature[] = { "java.lang.String" };   
                String params[] = { "${APP_INSTALL_ROOT}" };
                String domainPref = (String) adminService.invoke( thisObj, opName, params, signature );   
                out.println("<p>APP_INSTALL_ROOT = " + domainPref.toString() + "</p>");
            }   
        } catch (Exception ex) {
        	out.println("<p>APP_INSTALL_ROOT - "+ ex.getMessage() + "</p>");
        }    
    }