IIS 6.0: What is the sub application feature used for?

Hi everyone,
IIS 6 (I just concern with IIS because I'm using it :P) allows us to create sub web applications for sub folders of a web application. I.e. we can create a virtual folder/web site for a Web Application, right click on one sub folder of it -> properties -> Create sub application.
What is this feature used for? Is it run in the same AppDomain with its parent?
Web Application here means ASPNET 2.0 application.
Who is Participating?
QPRConnect With a Mentor Commented:
allows you to run some code/pages in their own application pool (memory space) so that if one site/app plays up it does not affect the performance of another. If I have read your question correctly.
thuannguyAuthor Commented:
Yeah, that's it. I thought the same. However, I didn't found much information about it in Google! That's why I have to come to this site!
Btw, do you know any resource for me to learn more?
Thank you in advance.
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