When people want to interact with other addresses (receive notes from them, really), they'll need to add their account to PXE's address book. There's not really a lot going on here other than having a store for these plus methods for interacting with it.
This will eventually be replaced by some mechanism where people discover handshakes that have been performed (and e.g. posted on-chain), but for now we'll rely on this manual operation.
When people want to interact with other addresses (receive notes from them, really), they'll need to add their account to PXE's address book. There's not really a lot going on here other than having a store for these plus methods for interacting with it.
This will eventually be replaced by some mechanism where people discover handshakes that have been performed (and e.g. posted on-chain), but for now we'll rely on this manual operation.