I have made a website using Dreamweaver.

I have a problem with the website, if I had viewed the pages before, and then updated the pages, then reviewed the pages again with my browser, the pages viewed have to be refreshed to see the new content.

I tested the website on other computers and we still have refresh to view the updated pages.

How do other sites get the latest up-to-date info on their site to show without the customer having to refresh the page each time they visit the site?

Is there a code I can enter into the website in order to make sure the updated page is viewed every time a person (new or revisiting) comes to the site?

Your help in this matter would be very much appreciated.

You can use meta tags to hint browsers about that:
http://www.web-caching.com/mnot_tutorial/how.html

If you're referring to something like Facebook does, where it automatically updates your page without oyu refreshing, you need to use a combination of Javascript and XHTML to do this.

Have you tried with PHP to disable browser caching?

This is the HTML forum, what makes you assume the OP has PHP available?