PuTTY – Registry Location for its settings
PuTTY is a handy little program, sometimes however you might like to change the background colours for multiple saved sessions, it can often be easier doing this in the registry, rather than via the GUI. The path you’ll need is “My Computer\HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\” Colour2 is the “Default Background”.