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To use two screens make sure you are using the latest windows operating systems like windows 10 and windows 11. connect the two screens to the computer. once both screens will display connection to your computer.
Additional instructions for HP Computers
Plug HDMI to HDMI Cable to first screen
Plug HDMI to DisplayPort (HP Computers only) cable to second screen
Turn Computer on and your both your screens should be activeTo purchase on click on this link HP Dual Screen Desktop Computer

How to use two screens on my new HP computer