[NTG-context] urgent help needed (registers)

Hi, I need to shape a index register as shown in this sample page: http://werksatz.com/attachments/index_sample.pdf -> the entries should be like \hangafter=1\hangindent=10pt\parindent0pt -> also the subentries (like in itemize: the "-" stands out) -> and the indicator should be the first character bold of the first entry with that letter (better see the example, it's hard to describe :-) How can this be done in MkIV?? Thank you very much, Steffen