Any way to prevent window splits for a window or a major-mode

[Robert Weiner]

I have looked through the Windows sections of the Elisp manual but did not see an option that would do this specifically, though I imagine it must be there.

For a window, I would like to be able to mark it so it is never split.

For a major mode, I would like to say for any windows displaying buffers in this major mode, don't split them.

Is there a simple way to program that?

Thanks,

Bob