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COM object you can use with ASP pages have several names. You will see them advertised and
described as MTS components, ActiveX control, ActiveX Documents, and Active Template Library objects.
But they are all exactly the same thing – COM object. Some COM object runs on the server and some run
on the client. You can easily extend the functionality of your applications through COM components in
exactly the same way other developer extends their Windows application. There are many commercial, free
and shareware COM components available on the Web, at Microsoft’s site, and from third-party vendors.
Control transactions you can use ASP to create mission-critical transactional applications. A transaction is any
set of task the must either all complete successfully or all fail completely. The classis example is a financial
transaction. When you pay by check or credit card, the bank must remove the money from your account and
credit the merchant’s account. If either part fails, you want both parts of fail. Forcing failure is difficult process,
because it means you have to undo the part of the transaction that have already completed.
Fortunately, there’s software available to help you monitor and control transactions. IIS 4 ship with a
transaction monitor called Microsoft Transaction server, which manages the process for you. In windows 2000
MTS is part of a group of services called COM+, but from a programmer’s point of view, both versions manage
transactions the same way. All you need to do is group the operations into a transaction. If the transactions
fail, MTS can automatically roll back the parts of the transaction that have already been completed.
Applications that use transactions typically must monitor the transaction to determine its status, and not all
transactions complete instantaneously. Some transactions may not all occur on machines or in code under
your control. In the financial transaction, for example, the merchant’s account may not be with the some bank
as your account. Transactions that occur on more than one system are called distributed transactions. MTS
manages transactions on disk, using a program called the Microsoft Distributed Transaction Coordinator. MTS
prepares each part of the transaction. When all the part has signaled their readiness, MTS issues a commit
command. As each part of the transactions completes, it notifies MTS, which logs a completion message. MTS
notifies the transaction owner about the state of the transactions and the outcome. In windows 2000, MTS has become part of COM+, and COM object running in MTS are now called COM+
applications. That’s confusing terminology, but it is part of Microsoft strategy to eliminate monolithic
applications. Instead of creating large application, you should begin to think about and design your
applications as a set of reusable, small, and lightweight components. How Web Requests Work Whenever
a user enters a URL into a browser’s address field, clicks a link or submits a form, the browser packages up
information about itself, the URL, and the user, and send that information to the server as a Web request. The
ASP engine consists of a collection of objects that contain information about the request.
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