#push takes a [[node]], a [[node/heterarchy]] or a URL. The meaning of pushing to a node is to publish the blocks or context in the destination node; the reference Agora publishes them in a similar format to local resources, either preceding them or after them depending on configuration. The meaning of pushing to a heterarchy (or "path") is to request attaching the resource or context at a point of insertion identified by the heterarchy as an anchor, if one is found (essentially allowing to fine tune placement).