Hi,

Essenetially Apache is a web slistener that services requests from clients launching the web browser. The basic file that governs the apacahe setiings is httpd.conf.

The middle-tier communicates with the db-tier through SQL*Net. If the call is for a static object like a form Apache knows where to pick the object based on the directieves set in the httpd.conf file. On the other hand if needs to make a call to DB (sql statement or Proc) it will forward the call usind the DAD information.

Hope this helps you understand the picture better.

Balaji K.