[NTG-context] Arabic typesetting with ConTeXt: 'hello world'

Dear all, I read Jon's, Khalid's, and Idriss' exchange of mails on typesetting Arabic a while ago. Problems with typesetting Arabic in context thusfar have been my only reason left for not switching over to ConteXt altogether. Idriss adviced to forget the mirroring thing as suggested on contextgarden, and use \setupdirections instead. Could anyone - perhaps Jon - please tell me in more detail how the working 'hello world' example looks like, including the references to the font ScheherazadeRegOT.ttf? Thanks in advance! Robert