Checking Millennium Catalog marc tags, we found out there is no |u in 555 field. This can be a big help for library archives staff to have a clickable hotlink for "Finding Aids". According to "Encoded Archival Description Cookbook" the ILS vendor should turn the 555 |u url link in order for libraries to make "Uniform Resource Identifier" clickable.
How other libraries are dealing with such an issue?