- <STRONG>delwin</STRONG>
- returns an error if the window pointer is
- null, or if the window is the parent of anoth-
- er window.
+ <STRONG>delwin</STRONG>
+ returns an error if the window pointer is null, or if
+ the window is the parent of another window.
+
+ <STRONG>derwin</STRONG>
+ returns an error if the parent window pointer is
+ null, or if any of its ordinates or dimensions is
+ negative, or if the resulting window does not fit in-
+ side the parent window.
+
+ <STRONG>dupwin</STRONG>
+ returns an error if the window pointer is null.
+
+ This implementation also maintains a list of windows,
+ and checks that the pointer passed to <STRONG>delwin</STRONG> is one
+ that it created, returning an error if it was not..
+
+ <STRONG>mvderwin</STRONG>
+ returns an error if the window pointer is null, or if
+ some part of the window would be placed off-screen.
+
+ <STRONG>mvwin</STRONG>
+ returns an error if the window pointer is null, or if
+ the window is really a pad, or if some part of the
+ window would be placed off-screen.