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These questions are about the avoidance of duplex printing.

To give some context, imagine that there are 14 pages in a document.
The first four must be non-duplex. The next five are to be given to
one person, and may optionally be or not be duplex. The next five are
to be given to another person. So these five must be separated from
the previous five, but within that five, may optionally be or not be
duplex. This PDF will be made from my PostScript, but somebody else,
who should be assumed non-expert, will be doing the printing.

The PostScript Reference manual describes <<  ...  /Duplex false  >>
setpagedevice

1. Can a PDF have an equivalent setting, and if distilled with Adobe
Distiller, does it correctly inherit it from the PostScript?

2. What does /Duplex false mean?

2a. Does it require only that this page must be recto? In which case,
if the following page does not specify /Duplex false, the following
page can be the verso to this page’s non-duplex recto? In which case
the first of each person’s five pages should be /Duplex false, and the
subsequent unspecified.

2b. Or does /Duplex false require that this page must be recto, and
also require that the verso must be blank. If so, how does one start a
new ‘duplex group’?

Or perhaps these things are not well specified, or not reliably
implemented to specification.

Thank you.