You may prefer to use the Wolfram MATHEMATICS package and try to connect your modules through the built-in SI code interpreter.

Check out the subprocess module 

Here is the link to the documentation: http://docs.python.org/3.2/library/subprocess.html

An example would be like this:

subprocess.check_call(["C:\Revit.exe", "your_argument", "your_argument", "your_argument", "your_argument"])

In computer science, this is known as inter-process communication.  More specifically, when a process spawns a sub-process, it is referred to as a child process.   A parent process and a child process can communicate using an Unnamed Pipe.  Independent processes (on the same machine) can communicate using Named Pipes.