I need to be able to update the content on the client machine when a web
service event is fired or an asynchronous callback routine is executed.  For
example, I open a page that will display a report with a message along the
lines of "The report is being generated."  I call the web service method to
create the report asynchronously.  When it is complete, the callback
procedure runs on the server, but how do I send a message to the client that
the report is ready and update the display?