Question on usage of some events in page flow logic

Hi Group,
I don't know how to use the following events and also not came across any example using these events:
1.OnRequest
2.OnDestroy
3.OnCreate
4.OnManipulation
please let me get some ideas from you on the above if possible with some simple examples.
thanks in advance.
Regards,
Vishnu.

OnCreate
OnCreate is called once when the page is first created (stateful mode), and performs a once-off data initialization or object creation.
OnRequest
OnRequest is called whenever a request is made for a particular page and is used to restore the internal data structures from the request. This is important when working in stateless mode.
OnInitialization
This event handler is mainly used for data retrieval. For example, it allows data required for displaying the BSP to be read from the database. It can also execute any program.
OnInputProcessing
This event handler checks and processes user input. It can also define navigation, that is, whether the user should be taken to the same page or another when the BSP is called.
OnManipulation
You can use this event handler to manipulate the HTTP data stream later.
OnDestroy
This event handler is available for special functions.
Refer the below link for more detail..
http://help.sap.com/saphelp_nw04/helpdata/en/c8/101c3a1cf1c54be10000000a114084/frameset.htm
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