There really is such a usage.
clearly gives a definition of the adjective instrumental as:
serving or acting as an instrument or means; useful; helpful
outside of my family, I'm not sure I've ever really heard anyone use it in that
sense. In his
professional work my father differentiated between what he referred to as
instrumental and terminal hypotheses. This was an attempt on his part to distinguish
between different sorts of assumptions that people make about how the world works,
or the reasons that motivate people to act in certain ways. Terminal hypotheses
are those that lead nowhere, that don't offer an opportunity for change, while
instrumental hypotheses are those that allow for solutions to problems that can actually be acted upon.
So what I've tried to convey through using that perhaps somewhat esoteric (in this context, at least) word, is that though I'll often make the most of any opportunity to simply click from
link to link (as much as I may feel embarrassed to admit it) my use of the web
of late has primarily been in order to accomplish a clearly defined task.
Go to: and that, and that, oh, and that ...