This is Microsoft's all-seeing-eye that monitors all textual input within apps to intelligently decipher what the user is trying to accomplish. All of this information could be gathered from apps like Word, Skype, or even Notepad by the Mediator and processed. So when the user goes to, for example, the Edge web browser to further research a topic, those contextual concepts are automatically fed into a search query.

The search engine (e.g., Bing and Cortana) uses contextual rankers to adjust the ranking of the default suggested queries to produce more relevant [results]. The operating system...tracks all textual data displayed to the user by any application, and then performs clustering to determine the user intent (contextually).