TN3270 Plus is a 3270 terminal emulator

Terminal emulator

A terminal emulator, terminal application, term, or tty for short, is a program that emulates a video terminal within some other display architecture....

. TN3270 Plus is one of the widely used Telnet

TELNET

Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communications facility using a virtual terminal connection...

 terminal emulators. TN3270 Plus is used for connecting Windows PC users to IBM mainframe, AS/400 and UNIX systems via TCP/IP. TN3270 Plus includes terminal emulation for 3270, 5250, VT100, VT220 and ANSI terminals plus an integrated set of TCP/IP utilities.

TN3270 Plus supports Windows 3.1x, 9x, ME, NT, 2000, XP and Server 2003. User can configure the desktop interface to the required specifications with keyboard mapping, color definition and customizable ASCII

ASCII

The American Standard Code for Information Interchange is a character-encoding scheme based on the ordering of the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that use text...

 to EBCDIC

EBCDIC

Extended Binary Coded Decimal Interchange Code is an 8-bit character encoding used mainly on IBM mainframe and IBM midrange computer operating systems....

translation tables.