Message getting strategy

[evolution test <testmrs evo gmail com>]

Hello,
I would like to know what is message collection strategy followed in tinymail.

I have got the account detail (account uri) & know the folder name from which i need to get message.

My query is :

- Do tinymail first get the header detail for all the mail & show on gui.
- once user click on any message then he will get the content for same message.
- is their any difference in handling message receving streategy for imap & pop account.
- How different type of MIME-Type filtering taken care. (like if message have Multipart/alternative then do we use only HTML part or we use text/plain as well (It is just an example)).

i don't no if i am asking so many question in one mail but i am very querious to know about complete strategy 

Thanks & regards,
Vijay