If you are writting the html in J, you could use the qt web viewer, and refresh 
that.  Sorry, if this is not help.
      From: Ian Clark <[email protected]>
 To: [email protected] 
 Sent: Wednesday, January 28, 2015 7:16 PM
 Subject: [Jprogramming] Refreshing a browser window in J
   
I note that in JQt the following will run the file: index.htm in the
default browser window/tab (e.g.Firefox):

  launch 'file:///Users/ianclark/Desktop/index.htm'  NB. Mac file
naming conventions

Now suppose I write out an updated copy of index.htm from my J app.
How can I now refresh the browser's display? I.e. to tell it to reload
the updated file?

Re-executing the above statement opens a new tab in the browser. I
don't want that. I want to refresh the display in the existing tab.
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