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The basic idea is that you define (or use) an application key, then define the known location(s) for that application. When submitting, you use the key for the executable field & let the appFinder do the rest.
AppFinder jobs require Python 2.x be installed on the workers. OS X comes with python pre-installed. Linux users can install python through the built-in package manager. Windows users will need to install Python manually. See Installing Python.
For detailed instructions, see AppFinder Jobs