[ESS] How do I best set up M-x R32 and M-x R64?

[Richard M. Heiberger]

Stephen,

I don't see
;;(setq-default inferior-S+6-program-name "Splus8") ; unix systems
;;(setq-default inferior-R-program-name "R")	    ; unix systems
as candidates for removal.  They have an entirely different purpose
than ess-r-versions.  They are for user-specification of which program
is called by the simple key commands M-x S or M-x R.

ess-R-versions is different.  ess-R-versions finds everything on the
computer and defines a version-specific emacs functionname, allowing
statements as M-x R-x.y.z

Rich