Edit: I was partly wrong; the matter is much more complex than that: interest in iOS and OSX might show up as interest in iPhone/iPad, and Mac/Mac OS; interest

Edit: I was partly wrong; the matter is much more complex than that: interest in iOS and OSX might show up as interest in iPhone/iPad, and Mac/Mac OS; interest in Windows, besides any interest in 'surface', might also show up as a generic interest in 'PC' or similar terms: you can make such assumption, since anyway those interested in 'linux' or 'OSX' would probably avoid using terms generally associated with Windows.