There is the conception of mozilla and many text editors that changing a
tab means to pass to other web page or other file to edit.

In Emacs, I propose , the behaviour of each event of a tab to be defined
using lisp functions, attached to the events that tab reponds to.

This does not mean necessarly only commuting to other buffer, or commuting
to other window; in order to make a tab that does such a commutation like
in other text editors,  particular lisp functions should be defined for the
events of that tab.