This command sets the name of a node. Node names must be unique; two nodes in the samme session cannot have the same name.
Node names are intended to be used as general-purpose node identifiers; unlike the numerical node IDs used to identify nodes in all commands, names are not session-local. This means that the combination of host ID (e.g. IP address) and a node name uniqely identifies a node in a way that is independent of any actual session with that host.