If you are on the brand new build of the Windows 10 January Technical Preview and you are also in the US with US English enabled, you are lucky enough to have Cortana too. Cortana is Microsoft's increasingly universal personal assistant found on the phone and now Windows (she also powers Maps too in a future update).
Did you know Hey Cortana is also available? Found on the Lumia 930 and Lumia 1520 with the Lumia Denim update (see our demo), Hey, Cortana lets you call up the assistant just using your voice. The feature is disabled by default, but here is is how to enable it.
Full story from the WindowsCentral blog...
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