I have Windows XP build scripts that look for R in a variety
of folders and if multiple ones are found, takes the last
one.  For example, I currently have the following 
in \Program Files\R :

        rw1060
        rw1062
        rw1071
        rw1071beta
        rw1081
        rw1090
        rw1090dev
        rw1091
        rw1091pat
        rw2000
        rw2001beta

Note that it currently correctly gets rw2001beta but if I
add rw2001 then it will not pick it up since rw2001beta
would continue to sort after it.

I tried using dates in my scripts to pick out the right one
but realized that it was somewhat error prone and decided to
move back to ordering by the names.

I wonder if a naming convention could be adopted that ensured
that the names sort in order.  For example,

        rw2010a - alpha, i.e. development version (previously rw2010dev)
        rw2010b - beta version (previously rw2001beta)
        rw2010f - final version (previously rw2010)
        rw2010p - patched version (previously rw2010pat)

Other possibilities might include an ascending numeric or date suffix.

I also thought about executing 
        bin\R --version 
or 
        bin\Rcmd --version
in each rw folder but am not sure if this works in all versions and
if it does whether the output is always provides a comparable
format.

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