The function find-dspec-locations returns the locations of the relevant definitions for the dspec dspec.
For each known definition recorded-dspec names the definition that defined dspec in location, and location is a pathname or keyword as described in at-location.
If dspec is a local dspec, the parent function is located.
The location information is collected from all finders on *active-finders*, that is, the relevant definitions are those known to at least one of these finders.
If two or more finders return the same pair (recorded-dspec location), as compared by dspec-equal and location equality, then only the first occurrence of the pair (in the order of *active-finders*) appears in locations.
LispWorks User Guide and Reference Manual - 20 Sep 2017