How to run commands in Rhino from Windows cmd.exe (command line) in an opened Rhino?
I know that “Rhino.exe /runscript=”-command1 -command2" executes them at the start, but what if we want to change something in an existing session?
Any hints, ideas appreciated!!! 
Perhaps use python instead of command prompt?
Thanks, and what would you recommend to communicate between python and running Rhino?
Python is part of Rhino. (IronPython engine is embedded in Rhino).
Also depending on what you want to do you can use Python module that can do your job without even starting Rhino. So…