Query screen resolution?

[Warpcat]

> Your question is based upon the notion that "the screen" is a meaningful
> concept. Once you move away from Windows (and systems which intentionally
> try to be like Windows), that's no longer true.

Good points.  Always something I haven't thought of.  Ok so... let's
*presume* the user has a measurable screen on win\mac\linux\etc since
on any other OS they wouldn't be running the app....