Basically, I've had times where they have gotten in the way and kept me logged into boards. You should find an option to delete the cookies on your system through your Internet options. I don't know what web browser you're using, so I can't give you exact instructions. They're all slightly different.HTTP cookies, sometimes known as web cookies or just cookies, are parcels of text sent by a server to a web browser and then sent back unchanged by the browser each time it accesses that server. HTTP cookies are used for authenticating, tracking, and maintaining specific information about users, such as site preferences or the contents of their electronic shopping carts.