I started using emacs for programming and for LaTeX and I would like to have it's basic commands on my background so I can easily just "show my desktop" using a shortcut... taking a look to my background to see the commands and returning to my emacs window to continue the work. I think it will be a useful customization for many users that like programming and especially for users that are not already used to emacs commands.
The best I could imagine is to have some basic commands on my desktop image and some shortcut keys to change the image to some more specific (for C++ language, for latex etc.)
I can create images using latex and the original background of my OS.
My question is if and how I can make these images to display as background by just pressing Ctrl+Alt+H or something similar.