-The \fBoverlay\fR and \fBoverwrite\fR routines overlay \fIsrcwin\fR on
-top of \fIdstwin\fR. \fIscrwin\fR and \fIdstwin\fR are not required
-to be the same size; only text where the two windows overlap is
-copied. The difference is that \fBoverlay\fR is non-destructive
-(blanks are not copied) whereas \fBoverwrite\fR is destructive.
-
-The \fBcopywin\fR routine provides a finer granularity of control over the
-\fBoverlay\fR and \fBoverwrite\fR routines. Like in the \fBprefresh\fR
-routine, a rectangle is specified in the destination window, (\fIdminrow\fR,
-\fIdmincol\fR) and (\fIdmaxrow\fR, \fIdmaxcol\fR), and the upper-left-corner
-coordinates of the source window, (\fIsminrow\fR, \fIsmincol\fR). If the
-argument \fIoverlay\fR is \fBtrue\fR, then copying is non-destructive, as in
-\fBoverlay\fR.
+.SS overlay, overwrite
+The \fBoverlay\fP and \fBoverwrite\fP routines overlay \fIsrcwin\fP on
+top of \fIdstwin\fP.
+\fIscrwin\fP and \fIdstwin\fP are not required
+to be the same size; only text where the two windows overlap is copied.
+The difference is that \fBoverlay\fP is non-destructive
+(blanks are not copied) whereas \fBoverwrite\fP is destructive.
+.SS copywin
+.PP
+The \fBcopywin\fP routine provides a finer granularity of control over the
+\fBoverlay\fP and \fBoverwrite\fP routines.
+As in the \fBprefresh\fP routine,
+a rectangle is specified in the destination window, (\fIdminrow\fP,
+\fIdmincol\fP) and (\fIdmaxrow\fP, \fIdmaxcol\fP), and the upper-left-corner
+coordinates of the source window, (\fIsminrow\fP, \fIsmincol\fP).
+If the argument \fIoverlay\fP is \fBtrue\fP,
+then copying is non-destructive,
+as in \fBoverlay\fP.