PuTTY is a communications tool for running interactive command-line sessions on other computers, usually via the SSH protocol. It can also communicate over a serial port, or speak various legacy Internet protocols such as Telnet.

Interactive command-line sessions on remote systems VT / xterm style terminal emulation Connect via the SSH protocol Connect via serial ports File transfer via SFTP over SSH Support for connecting via SOCKS or HTTP proxies Legacy Internet login protocols: Telnet, Rlogin, SUPDUP SSH key generator and SSH agent Batch-mode SSH tool 'plink' for automation Share multiple login sessions over one SSH connection

0.84 adds support for running a command before connecting (e.g. for port knocks or similar), and fixes minor security issues and some bugs relating to proxy servers and cursor blinking.