Novell NETWARE 6-DOCUMENTATION Manual page 1359

Figure 1 Service Location Protocol
User Agent
(Server)
Directory Agent Service Agent
User Agent
(Workstation)
Once the application has registered with the SLP User agent, it can look up a
service or get a list of services and read the attributes of a service, using either
blocking calls or synchronous calls. In the IP environment, this information is
pulled out of the Directory agent and put into NDS so that users and
administrators can know what services are available in a local area, provided
the proper security rights are granted.
A Novell client can use the User agent to go into an SLP Directory agent or
Service agent, or into NDS to reach out to other LAN or WAN segments, as
shown in Figure 2 on page 22.
This method does not rely on service information obtained from routers.
Instead, NDS is used for global communication of information. Through this
method, service updates on local segments are just as reliable and dynamic as
on IPX SAP-based networks.
21
Understanding Network Communications