(PuTTY is a Telnet, SSH, rlogin, pure TCP and serial interface connection software. Earlier versions only supported the Windows platform, and in recent versions began to support various Unix platforms, and plans to port to MacOSX. In addition to the official version, there are many third-party groups or their own ported PuTTY to other platforms, such as Symbian-based mobile phones. PuTTY is an open source software, mainly protected by Simon Tatham, licensed under MITlicence. Now the latest version is 0.61, which fixes many problems of Serial connection function.)