You can run multiple interpreters, embedded in the same application, in separate threads: multiplexing, as you have multiple instances, as opposed to multithreading, where you have a single instance.
From the docs:
> It should give you a Lua environment that allows you to effortlessly run tens of thousands of Lua processes in parallel, leveraging the famed microprocesses implementation of the Erlang VM. The empty Luerl State footprint will be yet smaller than the C Lua State footprint.