Standardized Stream Variables

• *standard-input*

  • Default stream for read-line, read-char, read, etc.

• *standard-output*

  • Default stream for write-line, write-string, print, etc.

• *terminal-io*

  • Value is ordinarily connected to the user’s console
  • Useful place to print log messages and warnings

• *trace-output*

  • Default steam for trace utility

• *query-io*

  • Default stream for stream-y-or-n-p

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