AKA "Popup Consoles" - Consoles are scripts that can cause a variety of effects when a surfer shows up at or tries to leave (depending on the console) a page with a console in the HTML code. Generally a single popup window is just referred to as a "popup" and the term "console" is reserved for consoles that either pop up many windows or have some other effect such as stealing the surfer's back button, forcing the browser to full screen so the surfer can't close the window, or many other things. Consoles are about the most aggressive advertising method currently available, and often tend to piss off surfers. That said, they're still a valid way to increase sales...which is why the standard tours of most paysites have consoles.
(a.k.a. command prompt, command line) A field at the bottom of the Unreal Editor that allows one to enter console commands in the editor. For more on the Console, see the Unreal Ed Interface document.
Linux users need an account to log in and use the operating system. The main way of using the system is the access the console. (Window-style systems often use graphical interfaces to 'hide' the console, but are in fact merely posing as a shortcut for it.) Using textual commands, you can carry out any complex tasks on a Linux system via the console. Networking, drivers, local tasks etc. can all be handled here, but it can prove complex. A decent grasp of the console is required for anyone who's serious about using Linux. Your distribution documentation may tell you where to find information on how to access the console. Absolute beginners should start here: http://www.math.mcgill.ca/services/linux_basics.php, while slightly more advanced users should read this site: http://librenix.com/?inode=4052