Convienience functions to set your Zillow Web Service ID as a global option
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A character string of length 1 with your Zillow Web Service ID.
Each subscriber to Zillow Web Services is uniquely identified by an ID
sequence, and every request to Web Services requires this ID. You may pass
your ID to each ZillowR function explicitly, but by default each function
uses the value saved in the global 'ZillowR-zws_id' option. The
functions make it easy to manipulate this option.
Visit the following URL to register for your own Zillow Web Service ID:
get_zillow_web_service_id returns a character value with the current
'ZillowR-zws_id' option, or
NULL if unset.
set_zillow_web_service_id invisibly returns
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