Messaging passing with a gui script (solved)

Questions
#1

I am trying to send a message to a gui script but the gui script doesn’t receive the message as I don’t know how to reference it. How can I do this?

#2

The boring but correct answer:
Read and understand this manual.

The fast and cool answer:
Put this in your gui script’s init function to find out the adress of the script:

print(msg.url())
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#3

thank you very much