Extended notifications

[akshay.bhagwat@wipro.com]

Hello Friends,
 
I am new to this area and was curious to know how the ABAP classes /
handlers used in this framework are used. Need your help on this front.
Wrt this topic, wanted to know how implementations of different classes
(e.g.  handlers etc ) is executed while sending notifications using
Extended notifications?
 
Just to elaborate , wanted to know  where can I find information about :
1. In which cases do we require custom classes to be used in Extended
notification?
2. How exactly implementation of these handlers etc is executed while
sending notifications? ( What program / code can provide insight as to
how these handler implementation is invoked? i.e.. where to debug to
find call to handler implementations )
3. Any sample implementation which can help to understand how custom
handler can be implemented used?
 
Appreciate any inputs on this front. 
Thanks in advance.
 
Regards, 

Akshay Bhagwat


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