This is often done by pop-up windows. Window chrome (title bar, button bar, address bar, status line) is removed. Often used in an attempt to prevent bookmarking which cannot be prevented this way. The only way I am aware of to stop people from bookmarking is using a session which expires. In many cases functionality built in the browser is reproduced on the page in windows without chrome. Also resizing is disabled in most cases. Some web browsers have the ability to (partly) protect its windows against this form of intrusion.
Read the rest of Modifying the browser window.
Note that your comment doesn't show up immediately. I review each comment before I add it to this site.
Check the Follow this page option if you want to receive an email each time a comment is posted to this page, including yours. A link to turn this option off will be included with each email.
Internet adresses will be converted automatically. You can use the following notation to specify anchor text for a link: [url=http://example.com/]example text[/url].