Chinese netizens also use the method of "tunneling" to access blocked webpages. Tunneling is when information is transmitted using a different communications protocol than the usual. One example of tunneling is if internet user "A" in China emailed internet user "B" in America asking for the contents of a blocked webpage. Internet user "B" could then respond with an email containing the contents of that blocked webpage, allowing internet user "A" to access the censored information. This method can be generalized by Web-page-by-mail services; for example, if an internet user emails web@cnn.com with the URL of a CNN webpage, that internet user will receive an email containing the contents of that specific Webpage.