Highlighting a Portion of the Screen

Oftentimes, a dashboard or a form can be very busy.  This can be our doing (we want to demonstrate our powerful dashboarding capabilities) or it can be the prospect's doing ("I'd like to see the following KPIs...").  The best way to approach this is still to simplify and remember that less is ALWAYS more.

There will still be times we want to draw the viewer's attention to particular parts of the screen.  What we DON'T WANT to do is move the mouse excessively to bring a viewer's eyes to a section of the screen.  What we WANT to do is to create a theater mode by darkening non-critical (i.e. not part of your story) areas:

I use an application called Target (by Nullmass).  It's a portable application that hasn't been updated since 2009 for Windows XP, 7, and 8+.  I have yet to find anything like it for the Mac.

There is no installer.  Simply double click and you'll see the application active in your taskbar.  Now whenever you want to highlight the screen, hit Alt-1 and you'll get cross hairs to draw your rectangle.  There are additional features, but I have found them rather useless -- I do not need to show each click with a ripple so that the viewer counts the number of mouse clicks, outline what I am typing (so when I create some Ctrl-Tab magic instead of a mouse click the viewer won't call me out), or set a countdown timer till the presentation starts (the demo never starts on time, right? -- and if you have time leave the screen on a self-explanatory report instead of the agenda!).

I've checked the Chrome store for an extension that does something similar, but to no avail.  What are some ways you bring focus to a portion of the screen?

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