| A set of software development and testing tools and technologies Microsoft
developed for use as the basis of Microsoft .NET, the melding of Windows and the
Internet so the two will work seamlessly together.
Put even more technically, Windows DNA is an architecture that describes how to
build “three-tier” applications, including presentation services, business
services, and data services.
Some of the tools within the Windows DNA framework include Visual Basic for
Applications, ActiveX, DHTML (Dynamic Hypertext Markup Language), and both COM
(Component Object Model) and DCOM (Distributed COM). The toolset also includes
liberal slatherings of XML (Extensible Markup Language) and SQL (Structured
Query Language).
In a three-tiered architectural model, presentation services include gathering
information from the user, sending the user information to the business services
for processing, receiving the results of the business services processing, and
presenting those results to the user.
Business services are responsible for receiving input from the user (via
presentation services), interacting with data services to perform business
operations that the application was designed to automate (such as income tax
preparation, order processing, and so on), and sending the processed results
back to the presentation layer.
Data services store data, retrieve data, maintain data, and also maintain data
integrity. Data services could include relational database management systems,
such as Microsoft’s SQL Server, e-mail servers (such as MS Exchange Server),
and such file systems as NTFS (New Technology File System). |
