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[QUOTE="Gabriel Genellina, post: 3440652"]
From the IDLE About box:

IDLE executes Python code in a separate process, which is restarted for  
each
Run (F5) initiated from an editor window.  The environment can also be
restarted from the Shell window without restarting IDLE.

(Personal firewall software may warn about the connection IDLE makes to its
subprocess using this computer's internal loopback interface.  This  
connection
is not visible on any external interface and no data is sent to or received
 from the Internet.)

From the help:

Running without a subprocess:

If IDLE is started with the -n command line switch it will run in a
	single process and will not create the subprocess which runs the RPC
	Python execution server.  This can be useful if Python cannot create
	the subprocess or the RPC socket interface on your platform.  However,
	in this mode user code is not isolated from IDLE itself.  Also, the
	environment is not restarted when Run/Run Module (F5) is selected.  If
	your code has been modified, you must reload() the affected modules and
	re-import any specific items (e.g. from foo import baz) if the changes
	are to take effect.  For these reasons, it is preferable to run IDLE
	with the default subprocess if at all possible.
[/QUOTE]

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