I use a IRC client that I wrote many years ago, in PHP (which isn't the programming language I would use if I were to redo it today), on Windows, with PuTTY as

I use a IRC client that I wrote many years ago, in PHP (which isn't the programming language I would use if I were to redo it today), on Windows, with PuTTY as the terminal emulator; I still use the same program, but now on Linux, with xterm as the terminal emulator.