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Another is a program called AdManager , which lets small businesses manage online keyword-advertising campaigns . Attacks which cause the most damage tend to originate with a buffer overflow , which lets experienced attackers completely compromise a system , and then introduce their own code , delete files , or purge users . Digital media are considerably more ' plastic ' than traditional media , which lets digital genres evolve more rapidly into varying directions . One of the most important tools we use is the conservation easement , which lets local landowners here in [ community ] protect their land from development .