Enterprise Library Logging Application Block Basics

[Anup Daware]

Hi Group,
Can somebody tell me where I can find the internals of Logging
application block 2.0/3.0.
I need answers for the questions like:
What best practices have followed in the implementation of logging
application block?
Is buffered writing is supported by this block?
Does it write synchronously or asynchronously to the specified
destination?
Like, let's say I am writing the log in the database then do I have to
wait for completion of logging process or it is done asynchronously,
so does my current thread do this for me or logging is handled by a
separate thread?
Any other benefits I get by using the logging application block?
Why shouldn't I for Log4Net of my own logger and use the enterprise
library Logging Application Block?

Any clue or even a link addressing these issues will be a great help

Thanks,
Anup