DDS's localhost plug-in is capable to deploy DDS agents on a local machine. Unlike SSH plug-in, localhost plug-in doesn't require a password-less access (public key, ssh agent, etc.).
The configuration file is not required for localhost plug-in.
The plug-in spawns 1 agent with a defined number of task slots on the local machine only. Just use dds-submit --slots X, where X is a desired number of task slots.
Call using a local system only to spawn 1 DDS agent with 10 task slots:
dds-submit -r localhost --slots 10