PuTTY is an advanced client for TELNET and Secure Shell connections that offers a broad range of features. The program has been around for a very long time. It is targeted to advanced users who might be administrating a network or working on a remote UNIX system through a shell account. The program is stable and creates secure connections across the Internet. Nearly every small detail in PuTTY is configurable through the menus. Unfortunately, there is no documentation meaning you might have to guess about some of the more unusual settings. PuTTY is incredibly stable and operates quickly. It does not have to be installed on a system and can be run from a thumb drive if necessary.
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