You need a modem connection or network connection, as well as terminal emulation software. The recommended commercial software is SmarTerm which can handle GCG graphics. The package PC/TCP also works. The most common free software is NCSA Telnet, but this software causes known problems with the cursor keys and has poor graphics capabilities. You can also use X-terminal emulator software which has good graphics capabilities.
SmarTerm is available from:
Persoft Inc.Free terminal emulation software is NCSA Telnet, available from NCSA, University of Illinois.