> one fundamental difference is that on Windows every application puts
> itself in the registry in a known location. As such it's easy for browsers
> to see if an app is installed.

Unless you installed some sort of plugin, no way to query the registry from
a webpage.

If you installed a plugin, it could perform any suite of tests it wishes, to
find out if something is installed.  Registry scan, filesystem scan, some
other scan, either way is just as effective.


> On *nix systems (including Macs) it's not
> as trivial to see this. I think that the closest that you have on *nix is
> the mime.types file.

Although technically possible to install apps to different locations, it's
generally irrelevant, and generally not the case anyway.  If you want to see
if I have Skype on the mac, just look under /Applications and Desktop and
$HOME, and if you feel like it, a few other locations, to see if "Skype.app"
exists.  It's a safe bet, if you scan a small number of locations, you'll
get 99% accuracy in locating it.  (Obviously I made up that number, but I
believe in it.)

Again, no browser plugin, no ability for a webpage to make such a query.
And if you have a plugin, it could perform any test suite it wishes.


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