> ## Documentation Index > Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt > Use this file to discover all available pages before exploring further. # Cluster.application_names > *property* Cluster.application\_names: [Set](https://docs.python.org/3/library/collections.abc.html#collections.abc.Set)\[[str](https://docs.python.org/3/library/stdtypes.html#str)] The names of the applications allowed to join the cluster.