NIO CommKit Host Interface Installation and System Administration Manual

4-4
Administering the CommKit Software and the STREAMS Listener
Why Two Servers?
The listener’s client application must call the network-independent
Transport Level Interface (TLI) library functions. The network service
module, not the application, dials the outgoing call. In your application,
specify the remote host in a t_connect() call and the service for the NLPS
string in a write() call. The advantage of using a TLI client and listener is
that the client application is network-independent, that is, it runs on many
network protocols.