Previewing Streaming Data
Opening data through a streaming connector displays the Start Preview 
button on the Data Source Preview section.
For example, opening a data source using the Kdb+ Tick connector displays the following preview:
Initially there was no data. Clicking the button displays the data and refreshes the values depending on the defined Auto Refresh period. The button eventually changes to 
.
Click to stop refreshing values of the streaming data.
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