Remains as defined in ANSI Common Lisp. Additionally, you can control the depth at which slots inside arrays, structures and conses are described.
An output stream designator.
displays information about the object object to the stream indicated by stream, as specified in ANSI Common Lisp.
Arrays, structures and conses are
d recursively up to the depth given in the value of the variable *describe-level*. Beyond that depth, objects are simply printed.
LispWorks Reference Manual - 20 Jul 2006