Polling tags only if used in current displayed page

Hello everyone,
could someone point me out at some docs for the following please?

I’m trying to test ignition as an HMI for the first time, and my question is which is the best way to poll specific tags only if they are being used in the current opened page.

Thanks for your time

You are looking for “leased” tag groups.

See here: Tag Groups - Ignition User Manual 8.1 - Ignition Documentation

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Thankyou sir.