Pixel Format

OpenGL OpenGL: Basic Coding
1

If I need to draw to a bitmap, I need a memory DC. My question is: Can(Should) I set pixel format for both the Memory DC and the screen DC? If I set both, is there any conflict between them?

2

I wonder if you can do that?
A more natural solution is perhaps just to save the OpenGL buffer as a bitmap.

3

I need to draw to the memory DC for some special reason.