There's multiple ways to pick, like any person, any fe/male person, by name, etc. Check the UIA instructions.
A POV button is just a button with triggers you set to, for example, set Embody on X person to Active, or any other trigger you'd like.
VAM triggers: Triggers are commands that perform an action on an atom's property. that translates into: something that does something on something Triggers in VAM follow this basic structure: Receiver Atom > Receiver > Receiver Target a.k.a. this atom > this thing in the atom > to do...
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