SYMPHONY can utilize any third-party communication protocol supporting basic message-passing functions. All communication subroutines interface with SYMPHONY through a separate communications API. Currently, PVM  is the only message-passing protocol supported, but interfacing with another protocol is a straightforward exercise.
Additionally, it is possible to configure the code to run in parallel using threading to process multiple search tree nodes simultaneously. Currently, this is implemented using OpenMP compiler directives to specify the parallel regions of the code and perform memory locking functions. Compiling the code with an OpenMP compliant compiler will result in a shared-memory parallel executable. For a list of OpenMP compliant compilers and other resources, visit http://www.openmp.org.