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Date:         Wed, 14 Oct 2020 11:08:41 +0100
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From:         Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: LaTeX3 and l3kernel requirements
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Status: R

On 13/10/2020 19:09, LARONDE Thierry wrote:
> Can you simply point me to the (u)pTeX .ch file and point me to the
> initial documentations/articles that list the primitives
> needed and what they have to achieve?

https://tug.org/svn/texlive/trunk/Build/source/texk/web2c/eptexdir/pdfutils.ch?view=log

contains I think all of the utility primitives. Quite a bit of code is 
devoted to setting up random numbers: it's basically a self-contained 
block. The other parts are actually more interesting from the point of 
view of integrating to other things.

Joseph