USAGE:

api.php?what=<search string>&where=<search field>&exact=[yes:no]

where search field is one of:

name_1
name_2
ethnicon
characterization
note
speech
book
casaubon_reference
kaibel_reference
note_reference

e.g.: 

http://digitalathenaeus.org/tools/KaibelDialogiPersonae/api.php?what=Alexandrinus&where=Ethnicon&exact=yes
http://digitalathenaeus.org/tools/KaibelDialogiPersonae/api.php?what=ATHENAEVS&where=Name_1&exact=no