Asp.Net: Order of HttpApplication events

 Question:

What is the order of the application events in a asp.net 4.0 application.
I have a HttpModule that subscribes to appliation events, in what order ?

Asp.Net: Simple HttpModule sample using Session

Question:

How do I create a HttpModule in asp.net ?
How do I get access to the Session in a HttpModule ?
Do you have a simple sample of a HttpModule in dot.net ?