(resent, previously sent from non member account) Found this on comp.arch "StreamIt is a programming language and a compilation infrastructure, specifically engineered for modern streaming systems. It is designed to facilitate the programming of large streaming applications, as well as their efficient and effective mapping to a wide variety of target architectures, including commercial-off-the-shelf uniprocessors, multi-clustered architectures, and the emerging class of grid-processors." http://cag.csail.mit.edu/streamit/ It does handle feedback loops among other things. /RogerL -- Roger Larsson Skellefteå Sweden