In my search for doing a 'supposedly' simple task, my days of research finally ended up with three answers. the good, the bad and the ugly.

But, first the question: Is it possible to use multiple internet connections for browsing? Put in a more general and a complicated set of words, "Is it possible to (seemlessly (5)) use multiple (unreliable (4)) interfaces in different (or in the same(1)) subnet(s) so as to allow one (or more) computer(s) to access the internet simultaneously?"