When you create a new connection using the File menu New... command, you are presented with the "Configure Session" dialog, which allows you to configure the most fundamental parameters affecting a terminal session, including:
"Connection Type": The method of making a connection. Currently Comet allows you to use MacTCP for Telnet network connections and Serial drivers for modem connections; Apple's Comm Toolbox may be supported in the future.
"Terminal Type": The preferred terminal type; the "Automatic" terminal type will default to a vt100 on a serial connection; on a Telnet connection "Automatic" will negotiate the "best" terminal type to use with the host.
"Hostname": If you are making a Telnet Connection, this field must contain the IP address or domain name of the host to which you wish to connect. Note that MacTCP must be configured correctly in order to make a connection, and that the configuration may need to be updated if you use this copy of MacTCP on another machine. You should contact your network administrator for "advice and consent" if you change your configuration.