1. A computer-implemented method of remote-controlled realtime data stream handling, comprising: at a local network node, receiving one or more stream handling instructions from a remote network node, wherein the one or more stream handling instructions comprise a specification of a stream handler for processing at least one realtime data stream; at the local network node, creating a stream handler in accordance with the specification; and producing a resultant data stream at the local network node, wherein the producing comprises processing a realtime data stream through the created stream handler.