Need advice on building overlay tool

[qwert]

I would like to build a standalone graphical "utility" that can draw a fixed-size oval on top of whatever is currently displayed on a PC's screen. As shown by the attached example, the actual application is to give an easy way to highlight an area of a picture during slide shows. The user would simply click once to make the oval appear -- and again to make it disappear. I've searched but not found much to go on. There was mention of 3rd-party "GhostIt" software, but the link is obsolete.

Does anything like this already exist? Is it practical to do with AutoIt3? Would using a rectangle make it easier?

I'm new at using AutoIt3 and any advice will be greatly appreciated.

[smashly]

Hi, _GDIPlus_GraphicsDrawEllipse() function will do exactly what your after.. will post example soon.

Cheers