Why do we need a portal server, why can't an application server do the same job?

what is the need of a portal server?
why can't the same work be done by an application server alone?
what is are the features of portal server which make it more attractive rather than an application server?

What Portal provides is
authentication
authorization,
user management,
security ( SRAP),
content presentation frame work ( URL Scraper provider, RSS provider and JSP provider )
dynamic vpn ( through netlets you can integrate any tcp based network application )
Wireless portal :-),
and a variety of other features ..
I don't believe app server provides all these features. Requirements of these features necessitates a portal market which the portal server addresses.

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Why do we need a portal server, why can't an application server do the same job?

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