I do a lot of signups for example on webmaster forums and sites that require you to be registered to view the content. Its a tedious task to enter the information that are required by hand. You often have to add more information but the username and password, name and location for instance.
Auto It is able to help you fill those fields automatically, but not only that. It uses a combination of simulated keystrokes, mouse movement and window/control manipulation in order to automate tasks. AutoIt v3 is a freeware BASIC-like scripting language designed for automating the Windows GUI and general scripting.
