I'm not sure if people still use EPSpline to make lathe and prism objects, but I
found the inability to take a photo or a sketch and actually trace around it
pretty limiting.

I found Auto Hot Key has a script that allows you to take a window, make sure
it's "Always on Top", make it transparent (0 - 255), and then set it to
"click-through" so that you can work with the window underneath it.

http://www.autohotkey.com/board/topic/53249-transparent-andor-always-on-top/

Opening an image file, I can use AutoHotKey as a transparent mask so that I can
use EPSpline to trace "under" the image outline.

Hope that's a useful trick for folks.

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