The design of VPP software development environment

VPP (Visual Programming Platform) is an integrated software development environment for Virtual Instrument (VI). It is based on a dynamic Extended Dataflow Language (EDFL) and allows users to graphically create block diagrams of their applications and interactively control inputs, outputs, and system variables. VPP builds on top of some experiences of HP-VEE/LabVIEW, is easier to user, more compatible and supported for quite some time. The system structure and semantics of EDFL are presented. With a precise specification of a language´s semantics and a system model, it is in many cases only a small step towards a new implementation.