Pause the load balancer to stop incoming requests to the servers?

Hi all,

I'm reading technet article for updating a farm http://technet.microsoft.com/en-us/library/ff806338%28v=office.14%29.aspx#usinginplace

What does exactly mean: "Remove the Web servers (WEB-1 to WEB-4) from rotation in the load balancer, or pause the load balancer to stop incoming requests to the servers"? Where I must do this?

Thanks

Emiliano