bl\optional{, br}}}}}}}}}
Draw a border around the edges of the window. Each parameter specifies
the character to use for a specific part of the border; see the table
-below for more details. The characters must be specified as integers;
-using one-character strings will cause \exception{TypeError} to be
-raised.
+below for more details. The characters can be specified as integers
+or as one-character strings.
\note{A \code{0} value for any parameter will cause the
default character to be used for that parameter. Keyword parameters