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We present a method for compiling a program which does not have a conventional tree-like hierarchy of control. Such a structure can arise quite naturally in applications which are strongly user-interactive or contain significant elements of transaction processing, dynamic modelling or process control. Having a heterarchical structure, the application program is capable of being executed simultaneously at an unlimited number of points. Thus a program involving parallel distributed processing, interleaving between processors or multithreading might take advantage of this approach. The encompassing execution strategy is based on the idea of tokens moving through a variant of a Petri net under the control of a firing protocol. We describe an approach to modelling control structures with Petri net semantics and means taken to provide complete reactivation control at run time

Compiling Heterarchical Programs by Means of Petri Nets