How does jni manage the asynchronous messages like vc++ does?

Hi,
I am trying to wrap a vc++ dll in jni.
Frankly,I a novice in VC++ and all the COM stuff.I just have a ready made VC++ code,I wish to use in my project.
The VC++ dll;sends and receives asynchrounous messages,defined in the VC++ "MESSAGE MAPs".
I wish to wrap this using JNI.I dont know WHERE to start and defintely am clueless as to HOW.
ANy...any help on this would be greatly appreciated.
thank you for you valuable pointers..in advance.
rum

Thank you so much.
But maybe your earlier answer was closer to my question.
My questions on this subject are so many that I am unable to pinpoint what exactly I want to know:)
After I received your answer I went back and did some homework on COM.
So armed with this new knowledge,I will try once more.
Scenario:
1. I have a VC++ dll,which I intend to use from a java application.
Therefore,I use JNI to wrap this dll.
2.
There is some COM code that needs to be wrapped as well.
I understand that this COM code will allow my java client application to receive message notifications asynchronously.
3.
I see now that I need to spun two seperate threads in JNI to handle this problem.
Thread 1: to initialize COM and to wait for messages from the server.
Thread 2:to do the other Application stuff.
QUESTIONS:
a. Am I right so far? :)
b. How does thread 1 communicate with Thread 2 on receiving a message?
Thank you so much for being patient.
These misplaced pieces of the jigzaw puzzle are killing me
Thanks a lot

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