Does anyone know how to setup/configure multiple servers (running apache) to handle a single page. Like I don't know how many servers webdeveloper.com use, but could anyone tell me:

- How to setup them to handle a single url (how request could be distributed)?
- How to transfer data between those servers?
- Is it important to ensure that all data stored in each server are exactly the same? Like session, data?

Thank you so much for help.