Can I use the HP Envy 5540 without a wireless router?
Yes, you can use Wi-Fi Direct to print wirelessly without a router from your computer, smartphone, or other wireless-enabled device. To enable it, touch the Wi-Fi Direct icon on the Home screen, and if Status is Off, touch Wi-Fi Direct Settings and turn it on. Note that a Wi-Fi Direct connection does not provide Internet access. (Page 5)
From the official HP Envy 5540 All-in-One Printer manual, page 5
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