These are bound globally to synonyms to the *background-* streams:
common-lisp
Synonyms to the *background-* streams.
The variables *standard-input*, *standard-output*, *trace-output*, *error-output*, *query-io* and *debug-io* are bound globally to synonyms to the various default streams as follows:
*standard-input* - synonym to *background-input**standard-output*, *trace-output* and *error-output* - synonym to *background-output**query-io* and *debug-io* - synonym to *background-query-io*
See *background-input* for details.
*standard-input* in the Common Lisp HyperSpec
*background-input*
LispWorks® User Guide and Reference Manual - 18 Feb 2025 15:32:15