Spreadsheet
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To enter a formula, navigate to a cell, press backspace, and then type your formula, e.g.
=SUM(A5:A12)
To subscribe to some topic, enter a formula
=SUBSCRIBE("http://crossbar.io/crossbar/demo/sliders/123456#master")
To publish to some topic, enter a formula
=PUBLISH("http://crossbar.io/crossbar/demo/gauges#0", A3)