I deleted the _ in the example and it still failed.  I used OARURL
    as the variable name.

Mrph.  I'll investigate.

    @set OAR-URL http://www.OARcorp.com
    @b{@value{OAR-URL},@value{OAR-URL}}

The - will be problematic in some cases.

    Can you @include{} a file name with an _ in it?

There's no braces in the @include command, but other than that, I
believe yes.  At least this file just worked:

    \input texinfo
    @setfilename foo
    @include uscore_.texi
    @bye

The file routines themselves in TeX have no problem with any characters
whatsoever in filenames; the only question is what catcodes have been
set, etc.  So it may fail in some contexts and work in others.

K

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