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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.54 *terminal-io* | Variable
  Value Type: a bidirectional stream. Initial Value: implementation-dependent, but it must be an open stream that is not a generalized synonym stream to an I/O customization variables but that might be a generalized synonym stream to the value of some I/O customization variable. Description: The value of *terminal-io*, called terminal I/O, is ordinarily a bidirectional stream that connects to the user's console. Typically, writing to this stream would cause the output to appear on a display screen, for example, and reading from the stream would accept input from a keyboard. It is intended that standard input functions such as read and read-char, when used with this stream, cause echoing of the input into the output side of the stream. The means by which this is accomplished are implementation-dependent. The effect of changing the value of *terminal-io*, either by binding or assignment, is implementation-defined. Examples:
       (progn (prin1 'foo) (prin1 'bar *terminal-io*))
       FOOBAR
        BAR
       (with-output-to-string (*standard-output*)
         (prin1 'foo)
         (prin1 'bar *terminal-io*))
       BAR
       "FOO"
See Also: *debug-io*, *error-output*, *query-io*, *standard-input*, *standard-output*, *trace-output* Allegro CL Implementation Details: None.

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