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The application interfaces with these back-end scripts need to be installed on the Workers. Similarly, there are a few jobtypes that also have front-end scripts to provide in-application submission that should be installed on the Client machines.
See http://www.pipelinefx.com/products/supported-applications and technical-specifications/ for a list of supported job types. Search http://wwwdocs.pipelinefx.com/docs for details on the specific application interfaces that you are using.
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