[NTG-context] What is the third parameter in \useURL for?

John R. Culleton john at wexfordpress.com
Fri Mar 24 00:59:37 CET 2006

For \useURL the first parameter identifies the statement, the
second defines the url, the third is usually blank and the fourth
gives the text to appear in the clickable area.

What is that third parameter for? 

John Culleton
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