Render to texture on another window context

K.I.L.E.R

Retarded moron
Veteran
With my image processing class picking up I've recently been doing more and more of the stuff in my spare time.
Recently I've come across some really ancient Windows games that work fine under Windows XP.
What I want to do is steal the context of the window and then apply a render to texture through the window. The reason I want to do this is to get rid of the pixelated 2D graphics by applying some kind of overlay.
However this is probably very complex and I would like to know what resources I would need to do this and whether it is worth the overall effort.

I'd imagine that it would be too much of a hassle to try and steal the window's context and so I would have to use an overlay pane to do this.

Can someone please lend me a few pointers about what I'm trying to do.
 
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