+ <STRONG>o</STRONG> <EM>ncurses</EM> then checks if the cell uses color, that is, its color pair
+ value is nonzero. If not, it simply replaces the attributes and
+ color pair in the cell with those from the new background
+ character.
+
+ <STRONG>o</STRONG> If the cell uses color, and its background color matches that of
+ the current window background, <EM>ncurses</EM> removes attributes that may
+ have come from the current background and adds those from the new
+ background. It finishes by setting the cell's background to use
+ the new window background color.
+
+ <STRONG>o</STRONG> If the cell uses color, and its background color does not match
+ that of the current window background, <EM>ncurses</EM> updates only the
+ non-color attributes, first removing those that may have come from
+ the current background, and then adding attributes from the new
+ background.
+
+ <EM>ncurses</EM> treats a background character value of zero (0) as a blank
+ character.
+
+ If the terminal does not support color, or if color has not been
+ initialized with <STRONG><A HREF="curs_color.3x.html">start_color(3x)</A></STRONG>, <EM>ncurses</EM> ignores the new background
+ character's color attribute.
+
+
+</PRE><H3><a name="h3-bkgrndset_wbkgrndset">bkgrndset, wbkgrndset</a></H3><PRE>
+ <STRONG>bkgrndset</STRONG> and <STRONG>wbkgrndset</STRONG> manipulate the background of the applicable
+ window, without updating the character cells as <STRONG>bkgrnd</STRONG> and <STRONG>wbkgrnd</STRONG> do;
+ only future writes reflect the updated background.