Eyh, Maughan, you just implied that catsailing is the operating system equivalent to MS Windows becouse viruses pop up everywhere and can't be removed without installing (at least the nasty ones). If compared to operating systems, catsailing at least must be linux or perhaps MacOS. Cool, adaptable, fast and affordable (having just ordered 60 MS Office licences), quite secure and easy to run once you know how to. In that setting, the F-16 class clearly is the "Thunderbird" browser.
Dont know what the Tornado class would be if it was an application in the same setting tough. Word Perfect perhaps?

"Camelot is such a silly place, lets not go there." Clikety-clop clikety-clop clikety-clop etc..