A task bar icon shaped like a loop of blue ribbon opens up an entirely new sidebar to tweak your PC, ask questions and control your apps.

Microsoft has begun building an AI chat interface straight into its single most important software product, the company said Tuesday. The tool will perform tasks like summarizing documents, suggesting music, offering tech support for your PC and answering questions you might ask a search engine or AI chatbot.

Windows Copilot is scheduled to arrive in a preview version of Windows via an icon in the task bar that looks like a loop of blue ribbon. Clicking it opens a chat interface sidebar where you can type questions or prompts like "enable dark mode" and click buttons to take actions. Microsoft will begin testing the feature in June, said Yusuf Mehdi, Microsoft's marketing chief for consumer products.

It's a major new step in Microsoft's embrace of artificial intelligence technology. Previously the company had built AI into its Bing search engine and Edge web browser, but Windows is used by millions more people and for many more hours a day.

"We are bringing the Copilot to the biggest canvas of all, Windows," CEO Satya Nadella said at the company's Microsoft Build developer conference. The arrival of AI chat interfaces is as important to computing progress as other major moments, like the arrival of the internet or the iPhone, he said.

Read more: Windows 10 Is Being Phased Out. Here's What That Means for You

And the change reflects a growing seriousness in modern AI. Google has begun building AI directly into search, Gmail, Docs and other key services used by billions of people. Adobe on Tuesday released a beta version of Photoshop that uses AI to generate new imagery. AI remains experimental, but no longer is AI on the periphery of the world's biggest tech products.

Microsoft also is building its Copilot technology into its Office suite of productivity tools.

Google has taken a different approach with its AI, restricting its more freewheeling chatbot technology to its Bard chatbot and adding more factual, literal tools to search, Gmail and other mainstream tools.

Mehdi thinks that's a mistake, though. Indeed, he hopes Google keeps the functions separate because that'll help Microsoft's prospects, he said.

"Customers have told us they're not a separate thing. They think it's all integrated," Mehdi said in an interview. "The ability to be able to ask any question from where you are, to get searchlike answers, that's a powerful thing for customers."

Read More: Microsoft Rolls Out Tool That Connects Your iPhone to Your PC

Microsoft added AI-boosted search results and an AI chatbot to its Bing search engine in February. It relies on OpenAI, an artificial intelligence powerhouse in which Microsoft has invested, for the core language processing technology. Thanks in part to the feature, Bing usage crossed the threshold of 100 million people per day, Mehdi said, though he wouldn't reveal the pace of the growth.

Also at Build, Microsoft announced it's making plugin technology available to Bing and Windows Copilot so developers can integrate their own software. That'll let you tap into those apps using Microsoft's AI interfaces.

And Microsoft announced that OpenAI is using Bing search engine data to help improve its ChatGPT chatbot. Search engines can be used to "ground" generative AI tools that can often make up incorrect information.