Short version (if you can answer the short version it does the job for me, the rest is mainly for the benefit of other people with a similar task):
In python in Wind
On Windows, you are looking at (Named or Anonymous) Pipes.
A pipe is a section of shared memory that processes use for communication. The process that creates a pipe is the pipe server. A process that connects to a pipe is a pipe client. One process writes information to the pipe, then the other process reads the information from the pipe.
To work with Windows Pipes, you can use Python for Windows extensions (pywin32), or the Ctypes module. A special utility module, win32pipe, provides an interface to the win32 pipe API's. It includes implementations of the popen[234]() convenience functions.
See how-to-use-win32-apis-with-python and similar SO questions (not specific to Pipes, but points to useful info).