Preface

WINDOWS WORKFLOW FOUNDATION (WF) is a general-purpose programming framework for creating reactive programs that act in response to stimulus from external entities. The basic characteristic of reactive programs is that they pause during their execution, for unknown amounts of time, awaiting input.

Reactive programs are, of course, not a new phenomenon. Ever since computers have been organized into networks, it has been useful for programs on one machine to communicate with programs on other machines. Techniques for exchanging data are also applicable to programs running on a single computer. A variety of technologies ranging from sockets to web services has been used over the years to get programs to communicate. Although the interoperability, ...

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