To find location information for definitions made in the running image or recorded in a tags database or a tags file:
The extent of the search is controlled by the value of the variable *active-finders*.
For example, to obtain the locations of the definitions of
across all dspec namespaces, call
(dspec:find-name-locations dspec:*dspec-classes* 'foo)
Another example of the use of find-name-locations is the LispWorks Editor tool's Find Definitions tab.
LispWorks User Guide and Reference Manual - 21 Dec 2011