Addon KOS programs that have full access to the system and its resources. Plugins behave much like a Knowbot Programs - they can create services and communicate with other processes. There are two key difference between plugins an KPs. First, plugins do not run in the restricted execution environment. Second, plugins are stationary programs installed by the KOS administrator.
a separate program that is launched by Blitzin and communicates with Blitzin, but otherwise runs independently of it
a shared library which is loaded into UPSTREAM when needed and extends UPSTREAM's capabilities without the use of an external program