Originally posted by MattR
What environment are you on? In unix, installing the Sybase-CT libraries should place an 'interfaces' file in your install directory (typically /opt/sybase*). In Windows, you need to look for SQL.ini.
If you have installed the Sybase software in /opt/sybase, the interfaces file will be /opt/sybase/interfaces.
If you have installed the Sybase software in c:\sybase, the interfaces file will be c:\sybase\ini\sql.ini
The interfaces file defines the server names, the connection library to be used by open client, the ip address of the host (or host name) and the port number the Sybase software is listening to.