There is never a global script needed, you're always able to put everything into a local script.
An example would be something like
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on:use {
add "Hi, this is a text";
add "It's from the buffer, you can make as many lines as you want.";
add "";
add "this was an empty line";
msgbox "example";
}
But I nearly never use that solution, I don't like it. But sometimes (especially with variable texts) it's usefull.