How can I just plot a pixel?

Maybe this seems silly.. but I'm wanting to build a game. I've been programming in C++ and Assembler for years but I'm new to development on the Mac. In fact, I've never really programmed under a GUI at all. I'm used to direct hardware access for plotting pixels on the screen.
Anyway, I've been looking at all these X-Code tutorials and they are all about creating text boxes, buttons, menus, etc. I don't care about any of that. I just want to be able to create a window on the screen of a set size, such as 640x480 and then be able to plot a pixel of any color at an x,y coordinate. I'll also need to be able to read the keyboard so that the user can control what is going on. I think I can pretty much take things from there if anyone could point me to an example showing how to do these things.

Click Photo Stream in your iPhoto (MBPro) and right click (control click) your choosen photo(s) to move to photo album.

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