Whenever you AOL sign in from a web browser, you can use the Remember Me option, which generates a cookie (small text file) that tells your browser to automatically login to the service for a time under your control (keeping you signed in). Regardless of how you have accessed your account, the automatic password for that particular browser would be transparent if you sign out manually: that's right, a cookie only affects the browser you are using, not any one that you might have installed on the same device. This transforms into a handy trick that allows you to login to the same machine as a different user, using only another web browser!