Hi Dave,
Here's a couple links that detail some of the uses for visaconf.ini:
http://digital.ni.com/public.nsf/allkb/19501D3240A6D6BF862569BA006E6EF8?OpenDocument
http://digital.ni.com/public.nsf/allkb/FC0FDBDCAF76B8D3862566E30062393D?OpenDocument
http://digital.ni.com/public.nsf/allkb/E33D8CB203A5F36686257064005AFA1D?OpenDocument
http://digital.ni.com/public.nsf/allkb/BF528312C9A5423A862565BC00731EC0?OpenDocument
Regards,
John E.
Applications Engineering
National Instruments