ASKquery is just one incarnation of an external procedure that can be used in an answer format. In principle, any routine that can be called from the ConceptBase server, can also be called in an answer format. The progamming interface is however not documented here since this requires extensive knowledge of the ConceptBase server source code. For the experienced user, we provide an example in externalcall.sml and externalcall.lpi. Note that one has to create a persistent database, load the model externalcall.sml into it, then terminate the ConceptBase server, and then copy the file externalcall.lpi into the database directory. Thereafter, restart ConceptBase and call the query EmpDept.