[pdftex] Spacing between letters ---plain pdftex

[Reinhard Kotucha]

John R. Culleton writes:

 > > > Whatever would we do without him?

I suppose that without the existence of pdftex we would do obvious
things, like swimming in the lake in summer instead of sitting in
front of a computer...

 > BTW Han's  \letterspacing primitive is not in the Pdftex Manual, at 
 > least not in my 2005 version. All the added primitives described 
 > therein have the \pdf prefix. 

Yes, Thanh worked recently on letterspacing, I don't expect that the
2005 manual is up-to-date.

 > WRT LaTeX I have used soul.sty

I'm not sure whether it's possible to provide letterspacing on macro
level at all.  Try this:

AV\par
A\kern0pt V\par
\bye

It seems that if you add \kern, you loose the kerning info provided by
the font.  Hence, I think that Thanh's primitive solves this problem.

Regards,
  Reinhard

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