thank you, now I understand!
was known to me as a PASCAL statement which includes unit files and which worked similar like
for (e.g., header) files in plain C
so I confused this C# command
by the aforementioned.
the other issue now is resolved, too – it wouldn’t work because inside an init procedure the instance variables woud be just local and not global and thus useless for their intended purpose.
But now it’s clear, thanks again!