Can I use Wi-Fi Direct to print without a router?
Yes, you can use the printer wirelessly without a router using Wi-Fi Direct. Make sure Wi-Fi Direct is enabled by checking the status in the Dashboard and then touching the Wi-Fi icon. By default, Wi-Fi Direct is in Automatic mode without an administrator password, allowing anyone in wireless range to connect. If you want higher security, HP recommends changing the Wi-Fi Direct Connection Method from Automatic to Manual and establishing an administrator password.
From the official HP Envy Photo 7800 All-in-One Printer manual, page 2
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