+ <STRONG>TABSIZE</STRONG> is a feature of SVr4 curses which is not documented by X/Open
+ curses.
+
+ <STRONG>o</STRONG> In SVr4 curses, <STRONG>TABSIZE</STRONG> is initially set from the terminal descrip-
+ tion's <STRONG>init_tabs</STRONG> capability. After that, it can be altered by the
+ applications using SVr4 curses.
+
+ SVr4 curses uses the current value of <STRONG>TABSIZE</STRONG> to compute the posi-
+ tion of tabstops for updating both the virtual screen with <STRONG>add-</STRONG>
+ <STRONG><A HREF="addch.3x.html">ch(3x)</A></STRONG> as well as the physical screen with <STRONG><A HREF="curs_terminfo.3x.html">mvcur(3x)</A></STRONG>.
+
+ <STRONG>o</STRONG> This implementation uses the current value of <STRONG>TABSIZE</STRONG> only for up-
+ dating the virtual screen. It uses the terminal description's <STRONG>it</STRONG>
+ (<STRONG>init_tabs</STRONG>) capability for computing hardware tabs (i.e., tab stops
+ on the physical screen).
+
+ <STRONG>o</STRONG> Other implementations differ. For instance, NetBSD curses allows
+ <STRONG>TABSIZE</STRONG> to be set through an environment variable. This implemen-
+ tation does not.
+
+ NetBSD curses does not support hardware tabs; it uses the <STRONG>init_tabs</STRONG>
+ capability and the <STRONG>TABSIZE</STRONG> variable only for updating the virtual
+ screen.