Who developed the software which is used as operating system of Magic Trackpad ?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Magic_Trackpad> <http://dbpedia.org/ontology/operatingSystem> ?x . ?x <http://dbpedia.org/property/developer> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Software>}
Magic_Trackpad