"Hindusthani Kafi[Kaafi]" is a Karnaatik Raagam adopted from Hindusthani paddhathi rather recently. An alternate Raagam "(Karnaatik) Kaafi was already existant . This Raaga in its present form is closest to Hindusthani Raag Piloo.
Hindusthani Kafi[Kaafi] has come to be known as just "Kaafi" in Karnaatik tradition. Generally this Raagam is not treated elaborately but as a thukkada[minor] Raagam to close the concert. "Piloo" also is a Raag generally used for Thumri-s at the end of a concert. So an elaborate Kaafi is rarely done. The celebrated Flautist Sri TR Mahalingam was specially fond of this Raagam and would relish elaborating it. I am indebted to him deeply for having revealed the various hidden recesses of this beautiful Raagam.