On Fri, Sep 19 2008, Alan Stone wrote:

> \useURL [url] [http://www.a.com] [] [wxyz]   % this does NOT compile

Perhaps an update will help. It works here with:
MtxRun | current version: 2008.09.16 19:49
This is LuaTeX, Version snapshot-0.29.0-2008072108

Cheers, Peter

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