Each machine entry contains the manufacturer, the model, the operating system, the host name, the proxy that has jurisdiction over the machine, and a list of modules that can run on the machine. It can also contain static machine specs such as RAM and processor speed. The human resource category contains entries describing people associated with the PSE project. It is currently empty. Currently, this directory contains entries describing proxies.
Proxies are daemons that can spawn processes remotely in lieu of rsh.
Each proxy contains a host name and a list of machines over which the proxy has jurisdiction. A powerful feature of LDAP is that it allows attribute values to be the distinguished names of other entries. This allows an entry to reference another entry by its distinguished name. This is important for the PSE because information contained at the leaves never needs to be duplicated. For example, when a client performs a query to obtain a list of machines, she can easily obtain information about the components that run on those machines by dereferencing the list of component distinguished names.