- Functions with a "mv" prefix first perform a cursor move-
- ment using <STRONG>wmove</STRONG>, and return an error if the position is
+ <STRONG>o</STRONG> If the <EM>win</EM> parameter is null, an error is returned,
+
+ <STRONG>o</STRONG> If the <EM>chstr</EM> parameter is null, an error is returned,
+
+ Functions with a "mv" prefix first perform a cursor move-
+ ment using <STRONG>wmove</STRONG>, and return an error if the position is