Works under MS Arabic Windows version 3.11 or Sakhr Arabic Windows with all Sakhr wordprocessors which support the technique i.e. alUstaz and Sakhr Publisher these fonts based on QSP )Quality Script Processor) engine which is unique characterized by infinite number of shapes for each character, overlapping connective shapes, points and diacritics are on line placed on corresponding shapes and justification by Irsal technique instead of Kashida insertion.