type: system variable location: built-in source file: xlinit.c xlio.c xldbug.c Common LISP compatible: yes supported on: all machines
*DEBUG-IO* is a system variable that contains a file pointer that points to the stream where all debug input/output goes to and from. The default file for *DEBUG-IO* is the system standard error device - normally the keyboard and screen.
*debug-io* ; returns #<File-Stream: #243de>
NOTE: *TRACE-OUTPUT*, *DEBUG-IO* and *ERROR-OUTPUT* are normally all set to the same file stream - STDERR.