The PGPGrid project aims to parallelise the process of extracting range data from an experimental 3D scanner using the Grid as a vehicle for accessing necessary resources. The application is potentially highly parallel but has some unusual features such as rapid spawning of processes in real time and a dynamic inter-process network topology. These characteristics are such as to require enhancement of the usual task migration capabilities of the Globus toolkit. The present paper initially discusses attempts to estimate the real parallelisability of the scanner application. It then describes a new Java API, based on Milner’s p-calculus, which could be used to extend Globus in a manner capable of supporting systems with this kind of dynamic parallel structure.