Some PSYC nodes (usually servers) or entities may provide the ability to relay packets.

Relaying MAY be done by servers which receive packets where the _target variable doesn't address a local entity, then the root entity will relay the packet.

When a packet is relayed it's original _source is moved to the _source_relay variable. The uniform of the relaying entity (either the root entity of a server or some other relaying entity) is then provided in the _source field.

NOTE: Usually PSYC roots limit relaying to trusted entities and sources, like for example Spec:Circuits from localhost.