void bkgdset(ch) void wbkgdset(win, ch)
Set the background character and attribute for the screen or a window.
The attribute in ch will be ORed with every non blank
character in the window. The background is then part of the window
and will not be changed with scrolling and in- or output.
int bkgd(ch) int wbkgd(win, ch)
Will change the background character and attribute to ch.