How does LyX call pdflatex ?

[Konrad Hofbauer]

Hi,

I am trying to hunt down a bug related to automatic reloading of the PDF 
file using Skim.

Can someone give me a quick idea how LyX converts to PDF (using pdflatex)?

LyX converts/exports everything into the tmp directory, and then?

A single pdflatex call without particular options, multiple calls, ... ?

Also, what is the real difference between View->PDF and 
View->Update->PDF. Only that the external viewer is called or not?

Thanks,
Konrad