A single server or an entire web domain can be blocked or allowed. For example, to allow popups from www.popupcop.com, enter this server name into the Allow List. To allow popups from all the web servers (e.g. www.popcop.com, secure.popupcop.com, etc.) in the popupcop.com web domain, enter *.popupcop.com into the Allow List. This mechanism operates independently of IE's security zones.

The arrow-buttons, & , allow you to move one or more entries between the Allow list and the Block list. Select the item or items to be moved and then click the desired arrow.

PopUpCop helps you form the proper URL to enter in the Enter new page, server or domain dialog. When you click on New (or select an entry in either list and click Edit) then you see this dialog:

This allows you to type in the URL (web address) of sites that you want to add to either list. The two buttons on the right, Make server and Make domain are URL helper tools. They allow you to take a complicated URL and quickly turn it into either a server address or a domain address.

For example, if you copy a URL from your browser, such as, http://www.popupcop.com/help.html?version=2.5.0.01&src=PopUpCop and then you paste this into the type-in field, clicking the buttons will simplify the URL and make it into a server or domain. Clicking Make server gives www.popupcop.com and clicking Make domain gives *.popupcop.com. The asterisk (*) tells PopUpCop to match any characters in the name. Thus, you can filter on similar domain names, such as abcdserver.com and xyzserver.com, by entering *server.com.

The Delete button removes the selected items from the list. To remove more than one at a time Ctrl-left-click on the items and then click the Delete button. A confirmation dialog appears for you to accept or cancel the delete action.