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Some of the application interfaces construct a commandline command-line that is then run directly on the Workers and do not require any additional installation. Other application interfaces (like Maya, 3dsMax, and XSI) are controlled via (perl or python) scripts. These scripts are installed on the Worker by installing the desired jobtypes.
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 http://www.pipelinefx.com/docs for details on the specific application interfaces that you are using.
Note: One You can centrally install these jobtypes on the network fileserver. See the configuration parameter worker_template_path for the search path used by the Workers for their jobtypes. Plus Also see Centralized JobTypes
Plus these:
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