How do I enable Wi-Fi Direct on my printer?
Press the Wi-Fi Direct button to turn Wi-Fi Direct on or off. If the light is blinking, a Wi-Fi Direct capable device is trying to connect to the printer—press the button to allow the connection. To print a Wi-Fi Direct guide, press the Wi-Fi Direct and Information buttons at the same time.
From the official HP Deskjet Ink Advantage 3700 All-in-One Printer manual, page 1
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