These different topologies can be constructed once for each use and then saved in the form of a pattern, thus making it reusable across the different teams as necessary.
Apache Tomcat 6 has good support for the Comet interaction pattern, making it an attractive option when asynchronous interactions are limited to this pattern.
If any are invalid, the advanced configurations are automatically removed from the pattern, making it then necessary to click the advanced options button and make new choices.