Correlation in bpm - Difference between activating and using correlation

Hi
I would like to know the difference between between activating a correaltion and using a correlation in a step.

Correlation is used when you have multiple recieve steps in the BPM to differentiate each file.
Consider your recive step is executed and the BPM is active waiting for the other file to comne in.
Before the next file comes in , if another BPM is activated becuase your recived recive1 message. Now, when the next message comes in , how does XI know which BPM instance is to be used.
Correlation is used in these cases. to corelate the messages.,
some people name their Correlation as correlation in IP. So it means using the correlation 'correlation'.
its like me creating a message interface by the name 'messageinterface' so finally i am using the message interface messageinterface !!!
Check this weblog ..
/people/sravya.talanki2/blog/2005/08/24/do-you-like-to-understand-147correlation148-in-xi
to understand it refer -
/people/sravya.talanki2/blog/2005/08/24/do-you-like-to-understand-147correlation148-in-xi
Also Ref checklist on when it is needed -
http://help.sap.com/saphelp_nw04/helpdata/en/6d/94364296f1b26be10000000a155106/content.htm
Thanks !!

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Message was edited by:
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PROGRAM form_test.
DATA: a1    TYPE p DECIMALS 3,
      a2    TYPE i,
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DATA:
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