1. DNA-(Distributed iNterNet Applications)
- a framework that describes how to develop:
• multi-tier
• high performance
• scalable distributed applications
over the network.
2. The Windows DNA Framework Diagram
The Presentation Layer
• responsible for :
– information gathering from the user;
– performing basic validation of user input;
– sending it to the business layer;
– receiving results of the business layer ;
– presenting results to the user in viewable formats such as VB forms.
The Business Access Layer
• responsible for:
– receiving input from the presentation layer;
– interacting with the data access layer to process the information and;
– sending back the processed information to the presentation layer.
The Data Layer
• directly interacts with the data, which usually reside in the databases such as MS Access.
• responsible for:
– storage;
– retrieval and;
– general maintenance of data as well as integrity of data.
