Hi, In the March 1996 article by MB and VY it is stated "The real-time kernel is itself non-preemptable ...". Could you tell me if this is still the case? I could not find any documentation on this. Thanks, Jason Shouler -- ========================= Jason Shouler DATAFLOW Tel/Fax : +44 (0)1202-722599 Mobile : +44 (0)7946-615718 (07946615718@one2one.net) =========================