- To make mouse events visible, use the <STRONG>mousemask</STRONG> function. This will
- set the mouse events to be reported. By default, no mouse events are
- reported. The function will return a mask to indicate which of the
- specified mouse events can be reported; on complete failure it returns
- 0. If oldmask is non-NULL, this function fills the indicated location
- with the previous value of the given window's mouse event mask.
+ To make mouse events visible, use the <STRONG>mousemask</STRONG> function. This sets
+ the mouse events to be reported. By default, no mouse events are re-
+ ported.
+
+ <STRONG>o</STRONG> The function returns an updated copy of <EM>newmask</EM> to indicate which
+ of the specified mouse events can be reported.
+
+ If the screen has not been initialized, or if the terminal does not
+ support mouse-events, this function returns 0.
+
+ <STRONG>o</STRONG> If <EM>oldmask</EM> is non-NULL, this function fills the indicated location
+ with the previous value of the current screen's mouse event mask.