"Ken Schaefer" <kenREMOVE@THISadOpenStatic.com> wrote in message
news:uKrua93PDHA.2424@tk2msftngp13.phx.gbl...
> Your data tier should probably be your database.
> Your business tier would be either a COM component or web classes
> Your presentation tier would be your .ASP page
>
> That's how I've typically see these types of things divided up.
>
> You may additionally choose to have a data access layer (DAL) which all
your
> middle tier code goes through to speak to the underlying data source.
>
> Cheers
> Ken
>
> "Brian Staff" <brianstaff@[NoSpam]compuserve.com> wrote in message
> news:%23qgQC22PDHA.2052@TK2MSFTNGP11.phx.gbl...
> : I was recently on a OO Design course<g> and as a result I've decided to
> : "Tier" my ASP classic pages for maintainability.
> :
> : Browser <----> PT <---> BT <---> DT
> : PT == Presentation Tier
> : BT == Business Tier
> : DT == Data Tier
> :
> : Right now, the browser communicates with just one ASP page and it's a
> fairly
> : simple job to divide each one into 3 separate ASP pages with each new
page
> : doing the work of one tier and communicating with the other tiers using
> : XMLHTTP (I'm using Msxml2.ServerXMLHTTP in non-async mode) and returning
> XML
> : to the calling tier.
> :
> : I'm a small web site, so right now, all of my tiers will exist on just
one
> : box. While I can get it to work, I've found that XMLHTTP communication
> : between pages on the same box does not work unless you use different
> Virtual
> : Directories for each tier _and_ you set them to different "Application
> : Protection" - high, medium and low. If you don't do this, the web server
> : "hangs" as MS so correctly states in point 2 of
> : http://support.microsoft.com/?id=290591
> :
> : The only solutions I see here is to either have separate boxes for each
> tier
> : or manage the protection for each Virtual Directory - both of which I
> can't
> : do, because the servers are not mine.
> :
> : Does anybody have any suggestions on how to solve this problem, as it
> seems
> : to be a fundamental weakness in IIS. I'm guessing that large sites have
> the
> : luxury of separating the tiers onto distinct boxes, but what do other
> : small/medium sites do, that want to maintain "tier" code?
> :
> : BTW - it does not seem to matter whether the type of protection is
higher
> or
> : lower for the calling page to the called page - it just needs to be
> : different - is that understanding correct?
> :
> : Brian Staff
>
>

"Brian Staff" <brianstaff@[NoSpam]compuserve.com> wrote in message
news:%23qgQC22PDHA.2052@TK2MSFTNGP11.phx.gbl...