isr.co.ro : glossary Cancel In most programs, to request the termination of a pending request. For example, if you ask your browser program to save a page and then change your mind, instead of entering a file name in the file dialog box you click the cancel button. As applied to Usenet newsgroups, to request the removal of an article (a single posting). Since Usenet is a decentralized system with no single authority, it is up to the receiving system whether or not to honor the request. On many proprietary e-mail systems, an option that lets you delete a message after it was sent if the recipient hasn't yet retrieved it. Unfortunately, there's no equivalent for most Internet-based mail systems.