[Tutor] Learning about callbaks

[Michael Bernhard Arp Sørensen]

Hi there.

I want to learn about callbacks because we use it at work in our software.

I there a short "hello world"-like version of a callback example?

-- 
Med venlig hilsen/Kind regards

Michael B. Arp Sørensen
Programmør / BOFH
I am /root and if you see me laughing you better have a backup.
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