Low level resources are those which are provided as part of a hosting contract. These resources are accessed via the Hosting Service under which a netlet is running, and are billed and accessed under the same contract.
Disk space and networking are the basic low level resources, but any type of resource may in princpal be tied in to a Hosting Service.
These resources are not necessarily services as such, because a warrant is not required by a netlet to access them, and they are not available except to those netlets running under the Hosting Service which controls them.
Applications may be written to require access to any resource as if it were a low level resource. The applications' Hosting Service may subcontract the resource to a ``real'' Jtrix service if required.