[plt-scheme] Is packages installation portable?

Hello,

where are installed PLT packages? To me it seems they are installed in
"%USERPROFILE%\Dati applicazioni\PLT Scheme\planet\300\4.2" (Windows).
Is that correct?

Should I execute a program on another machine, am I required to
install them again or would suffice copying such directory and
referencing it in PLTCOLLECTS? The second machine has not an Internet
collection.

Thanks.
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