Criteria for dividing an application between multiple WARs

What criteria are generally used when deciding on the division of a large application between several WAR files?
I'd imagine that an eBay wouldn't put their entire web application into a single WAR. But I am unsure of what they would consider when deciding how they would split up their application.
As each WAR file has its own context under the web server (is this correct?), I have the feeling from looking at a few tutorials (and seeing what's in the address bar) that it's to be split up by function (e.g. contexts paths for /register, /checkout, etc)
Though the above doesn't seem like I'm interpreting their intentions or this concept correctly. If somebody could please help to explain the guidelines behind such a decision, that would be highly appreciated.
Thank you for any explanation you can provide.

bravebuddy wrote:
Thanks for the reply. We are using cookies and all of the WAR files are under the same domain. The issue is when the user moves from a page in one WAR to a page in another WAR, the session data does not transfer with the user (the get a new session).Yes, I already understood the problem. Did you on your turn understood my answer "This is forbidden as per the Servlet specification" ?
Is it correct to assume the only way to do this is to set up a persistence layer to hold basic session/user information that is accessible from all WARs and then use the common JSESSIONID that they all share (since they are under the same domain) as the Primary Key?It´s not the only way, but one of the ways, yes.

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>
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>
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Criteria for dividing an application between multiple WARs

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