+ Besides the problem of opaque structures, the data stored
+ in like-named members may not have like-values in differ-
+ ent implementations. For example, the WINDOW._maxx and
+ WINDOW._maxy values in ncurses have (at least since
+ release 1.8.1) differed by one from some other implementa-
+ tions. The difference is hidden by means of the macro
+ <STRONG>getmaxyx</STRONG>.