Explain some DNS redirecting functionality

I need an explanation of how the redirecting outlined below and need a simple (Hello World) example that I can set-up. ## Deliverables The following are part of the configuration instructions from a white-label site: Point the [login to view URL] DNS "A" Record to {the WL IP address} Point the [[login to view URL]][1] DNS "A" Record to {the WL IP address} Point the [login to view URL] DNS "A" Record to {the WL IP address} Point the [login to view URL] DNS "A" Record to {the WL IP address} Point the [login to view URL] DNS "A" Record to {the WL IP address} I need to know how implementing these changes work to enable the WL site to send their content through my site. I will also need a simple demo of how to mimic the process that takes place when a site is configured in this way.