Jtrix doesn't provide any form of UI.
More mainstream systems have at least a process level interface allowing one to query running processes, list resources in use, and forcibly terminate processes. Jtrix applications require something similar.
Many applications will need an administrative UI specific to the application; this may be implemented using the same mechanisms.
Nodes can offer access to the kind of information and control we require; this access is provided through specialised node facets. Other netlets should be able to gain access to these facets only according to the terms of the hosting contracts involved.
We need to standardise the facets involved for these operations to be universally available. Thus UIs are pluggable and can vary with need.