Distributed*
This feature is work in progress and will be added soon*.
ALT is ideally suited for distributed computing exactly because everything is immutable in ALT. A key insight is that immutable code, immutable values and their immutable provenance can be cryptographic hashed (and signed) to unforgeable unique identifiers. Think GIT but then for code and values.
Related concepts can be found in Enchilada and Manikin by the same author of ALT, and in work such as Unison.