Executable Formats and Dynamic Link Library concepts

Hi All,
I have been working on Windows CE Platforms for quite sometime and there are some
1) Interesting techniques for Dynamically loading and unloading a library.
2) Executable formats used.

Just wondering how things are done on other OS Platforms esp. Symbian..,
Although the Concepts will be similar... I am aiming to Understand the differences,if any in
other platforms

I am preparing an article on things that i know in this area ... will post it within this weekend ... lets up everything that we know in this topic...