Ports - Impro Technologies Compatible Computer Devices

Description extracted from Wikipedia:

Impro: Improvisation and the Theatre is a book written in 1979 by theatre educator Keith Johnstone. The book is divided into four sections: "Status", "Spontaneity", "Narrative Skills", and "Masks and Trance". Much of the book is based on his experiences as a teacher and as an associate director of the Royal Court Theatre in London.