Multiprocessing doesn't seem to work?

[DeaD_EyE]

Then use subprocess:

(I have not tested the code)

import sys
import time
from subprocess import Popen


def start_script(filename):
    proc = Popen([sys.executeable, filename])
    return proc

# s3nd and r3ceive are bad names
sender_proc = start_script('s3nd.py')
receiver_proc = start_script('r3ceive.py')

# don't forget to put the if __name__ == '__main__'
# into your modules bottom and call the sender and receiver.

time.sleep(10)
sender_proc.terminate()
receiver_proc.terminate()

The question is, what happens if receiver runs before sender?
Your problems goes deeper as you think. The whole structure is wrong.

I think a Queue can solve this problems.
Writing to a file and reading it from another process is very fragile.