-upon successful completion.
-\fBmousemask\fR returns the
-mask of reportable events.
+upon successful completion:
+.RS 3
+.TP 5
+\fBgetmouse\fP
+returns an error.
+.bP
+If no mouse driver was initialized, or
+if the mask parameter is zero,
+.bP
+It also returns an error if no more events remain in the queue.
+.TP 5
+\fBungetmouse\fP
+returns an error if the FIFO is full.
+.RE
+.PP
+\fBmousemask\fR
+returns the mask of reportable events.
+.PP
+\fBmouseinterval\fR
+returns the previous interval value, unless
+the terminal was not initialized.
+In that case, it returns the maximum interval value (166).
+.PP