If you wish to be able to easily distinguish Secure Shell (SSH) sessions to a particular server when using PuTTY, a free and open-source SSH and Telnet client application available for Microsoft Windows, OS X, and Linux systems, you can change the background color used for connections to a particular server through PuTTY's "Change Settings" option, which will allow you to change the background and foreground colors (the foreground color is used for text). Colors are specified by RGB value.
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