If there is exactly one such database, it is returned and the second return value count is 1. If more than one databases match and errorp is
nil, then the most recently connected of the matching databases is returned and count is the number of matches. If no matching database is found and errorp is
nil is returned. If none, or more than one, matching databases are found and errorp is true, then an error is signaled.
LispWorks User Guide and Reference Manual - 13 Feb 2015