Different systems are programmed to show different content.

But, it just so happens that there will be a paper presented at the Annual
ALA MARBI meetings that will deal with this issue. It will be Proposal No.
2000-07: Definition of Subfield $y (Link text) in Field 856 and will be
available in about a week at the MARC Web site. An announcement of its
availability will be forthcoming.

^^  Rebecca S. Guenther                                   ^^
^^  Senior Networking and Standards Specialist            ^^
^^  Network Development and MARC Standards Office         ^^
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On Tue, 2 May 2000, John Robert Gardner wrote:

> When an 856 with a $u field is used, does anyone know what the display
> actually shows--preferred, best practice, whatever--as the blue hypertext
> that is the clickable link?  In other words, is the full http://whatever
> string from the 856 $u the actual blue clickable text, or is it something
> else?