You can use the AUTHSVR(5) server to provide individual client authentication for an application. The tpinit() function calls this server when the level of security for the application is TPAPPAUTH.

The service in AUTHSVR looks in the data field of the TPINIT buffer for a user password (not to be confused with the application password specified in the passwd field of the TPINIT buffer). By default, the system takes the string in data and searches for a matching string in the /etc/passwd file.

When called by a native-site client, tpinit() forwards the data field as it is received. This means that if the application requires the password to be encrypted, the client program must be coded accordingly.

When called by a Workstation client, tpinit() encrypts the data before sending it across the network.