You can use this piece of code in a EA or a script but this isn't a EA or a script

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I was reading some posts and came across this post below.
I'm a true novice when it comes to stuff like thisl
Can some tell me whether this is a script or ea?
and how do I test this to see if and how it works?
Appreciate any help
Alternative method to mimick CTRL+F5 keyboard shortcut:
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