Like the PSP before it, the PlayStation Vita can access content on a PS3 and even play PS3 games remotely.
Inside PlayStation 4
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PS3 How To: Remote Play
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As much as I loved remote play with the PS4, it would have been really cool at the time to have a fully developed remote play feature with the PS3. : r/ vita
PS4 Remote Play on any Android device with unofficial app
PlayStation Vita can be used as a PS3 controller – Destructoid
How to Use PS4 Remote Play - PlayStation 4 Guide - IGN
PSVita Remote Play Experience in 2020
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