Orc is a programming language designed to make distributed and concurrent programs simple and intuitive to write. Orc expresses orchestration, a type of structured concurrency. It emphasizes the flow of control and gives a global view of a concurrent system. Orc is well-suited for task orchestration, a form of concurrent programming with applications in workflow, business process management, and web service orchestration. Orc provides constructs to orchestrate the concurrent invocation of services while managing time-outs, priorities, and failures of services or communication. To learn more about Orc and run your own Orc programs, visit the website: http://orc.csres.utexas.edu/ .

Unless otherwise noted, all material in this document pertains to the Orc language implementation version 1.0.0 .