Understanding the URL that Displays for a Page

The URL that displays for each page indicates the location of Oracle Application Express and identifies the address of Oracle Application Express, the application ID, page ID, and session ID. For example:

http://apex.oracle.com/pls/apex/f?p=4350:1:220883407765693447

This example indicates:

apex.oracle.com is the URL of the server
pls is the indicator to use the mod_plsql cartridge
apex is the database access descriptor (DAD) name. The DAD describes how HTTP Server connects to the database server so that it can fulfill an HTTP request. The default value is apex.
f?p= is a prefix used by Oracle Application Express
4350 is application being called
1 is the page within the application to be displayed
220883407765693447 is the session number