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Yet another means of distinguishing multiple PuTTY sessions: replacing the normal PuTTY window/taskbar icon with a different one, on a per-session basis.
Technically, the hardest bit of this I see is implementing an icon chooser. As far as I know there's no convenient icon chooser in Common Controls or Common Dialogs that we could use. Implementing one ourselves seems like a lot of work and would also bloat PuTTY.
An alternative would be to only allow a file to be picked, and take the first icon in the file, but that's a bit naff.
PickIconDlg; there's some faff involved but it does appear to be available across a wide range of Windows versions. (Not sure about Win32s.)
TuTTY implements something like this.
Also, we already have various means of distinguishing sessions, and we keep getting asked for more. If we added them all, PuTTY would balloon.