Computer screen 'mirroring'

[Big D]

Hi folks. I've got a friend who has a problem.
He badly needs a reliable way to 'mirror' the image on his monitor. I mean, turn everything on screen into a mirror image. This's just so that the monitor can form the basis of a home-made projector. One way to acheive this 'image inversion' was a physical reconfiguring of the wiring inside the monitor, but this proved to not be wholly reliable. I was wondering if any of you know of a programme that can do this same job? There's plenty of software which can 'rotate' the image though 90 or 180 degrees, but apparently nothing that can reverse the display entirely.
I'll deeply appreciate any help:)

Edit: I believe this is called 'yoke flipping', if that helps.

[crono_logical]

http://www.dameon.net/BBBB/yoke.html
http://www.arcadecollecting.com/info/flip/flip_monitor.txt

I think both describe rewiring physically in different ways, dunno if that helps. I'd be interested in a software solution too though, just for fun :D

[Dr Unne]

Do you know anything about programming, Big D? There has to be a software solution. Windows lets you take a screen dump with Printscreen. There has to be an API call for it or something. If you could take screen dumps and do some manipulation on them and display them fast enough it should work, shouldn't it? I don't know if I could write a program that does that, but it has to be possible. People write programs called screen scrapers that take screen dumps of web browsers and extract text and data from them, for example. Ther are viruses that flip your screen upside-down or mirror it, I think, but you might not want to purposefully get a virus. But I'm sure it's possible to write a program for it. Rewiring your monitor might be easier, but probably not safer. (EDIT: I assume you're using Windows.)