Changing a batch file when its running

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I just tried it, and against my intuition, it picked up the new commands at the end (on Windows XP)

I created a batch file containing

echo Hello
pause
echo world

I ran the file, and while it was paused, added 

echo Salute

Saved it and pressed enter to contine the pause, all three prompts were echoed to the console.

So, go for it!

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