[R] How to test a time series fit the Poisson or other process?

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Hi, R-Help,
I am a newbie.
what I concern most recently is the analysis of the time series,
But there are a lot of package in my eyes.
All I want to try is as follow:
How to test whether a time series fit the Poisson or other process in R? 

Thank you very much in advance.

¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡guangxing at ict.ac.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-11-25