Windows Internet Explorer implements various protocols that can be used to identify certain information. A protocol is a set of rules and standards that enables two or more computers to communicate.
Note 'about:' is not a protocol as it does not enable two or more computers to communicate (see earlier definition). No data is being sent to the client — the client is simply being instructed to display a certain pre-defined set of information.
Specifies a data URI, which is a resource, typically an image, embedded in the URI as opposed to one loaded from an external URL.
Opens a file on a local or network drive.
Opens a file transfer session with the specified site address.
Opens a gopher session with the specified site address.
Opens a hypertext transfer session with the specified site address.
Opens a secure hypertext transfer session with the specified site address.
Opens a client's e-mail system and begins a new email message.
Opens a newsgroup in the client's default news application.
Specifies a resource that will be obtained from a module.
Opens a terminal login session with the default Telnet client.
Obsolete for Microsoft Internet Explorer 6 for Windows XP Service Pack 2 (SP2) and later. For earlier versions, opens a Web page in the client's default HTML editor.
Note Some of these protocols are no longer supported by Internet Explorer.