Nana,
Here's how to think of the components you mention. ESS/MSS is presenting data as a portal from a back-end datasource (assuming SAP ERP / ECC). TREX indexes particular content in the ESS/MSS portal for end-users based on specific configurations that have been performed to achieve better performance. If TREX is removed or unavailable, that shouldn't break the ESS/MSS portal but will have performance side effects at a minimum. The webdispatcher allows load balancing between multiple ESS/MSS portals based on the the webdispatcher profile configuration.
With the webdispatcher configured and running, users would access the webdispatcher URL as opposed to the ESS/MSS portal directly to login. If the webdispatcher is down, users will still be able to access the ESS/MSS portal directly unless additional configuration is performed to limit access.
Regards,
Josh
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