Canada,
Trading Networks Server:is the add-on component of IS server which manages the transactions Externally/Internally and stores transactions data in database
Trading Networks Console:Its a tool which will connects to TN Server and using this Console we can monitor/track and route any Transactional documents to External Partners or internal Trasactions (like different business units)etc…
For better understanding take a look into TNConsole/doc/wMTN_BuildingYourNetwork.pdf
Broker handles pub/sub mechanism with in Enterprise and now in version IS6.0 sever, both IS/Broker are merged with eachother.
HTH.
#webMethods#B2B-Integration#Integration-Server-and-ESB