Last week I learned a very interesting lesson. I am just in the end phase of a custom software delivery project. Using OLIVANOVA’s model driven software development approach, I created a three-tier application with an ASP.NET client, a COM+ based server tier and MS SQL Server as the persistence layer. The COM+ application is deployed to a dedicated server along with the SQL Server database management system.

The ASP.NET application is created on another server that lives in a DMZ (demilitarized zone). This web server does not have access to the Internet from inside, but is accessible from outside of this company. A connection (HTTP) from the web-server to the database server is then responsible for communication between the user-interface and the server tier.