With the change, the IE browser has been programmed to detect whether a pop-up or pop-under window is unwanted if it doesn't directly result from the customer's clicking on a link on a Web page. "If users decide to view a blocked pop-up ad, they can simply click on the pop-up blocking menu in the status bar to view the pop-up once or add the Web site to the "safe sites" list. For businesses, this protection will not affect existing intranet sites and line-of-business applications, because pop-ups are not blocked in the local intranet zone," Microsoft explained in a fact sheet.