What is EM, OMS, DBConsole, and emagent?

Hi, all.
What are the differences among the following terms??
1. EM --> Enterprise Manager
2. OMS --> Oracle Management Service
3. DBConsole
4. emagent
In addition, what do they do respectively??
I created a 2 node RAC db with Enterprise Manager option
by using DBCA. This is all what I did.
Any advice and html link will be greately appreciated.
Thanks and Regards.
Message was edited by:
user507290

Hi ,
Take a look at the following:
http://download.oracle.com/docs/cd/B19306_01/em.102/b31949/toc.htm ,
http://download.oracle.com/docs/cd/B19306_01/em.102/b40002/toc.htm and
the glossary is at:
http://www.oracle.com/pls/db102/to_toc?pathname=mix.102%2Fb14388%2Ftoc.htm&remark=portal+%28Books%29
Greetings,
Sim

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