h6. [[WindowManager]] h6(. » [[WindowManager SWI Calls|SWI Calls]] h6((. » [[Wimp_Poll|Wimp_Poll]] h6(((. » [[Reason Codes|Reason Codes]] h6((((. » Null_Reason h2. Null_Reason h5. (Reason Code 0) This code is returned from [[Wimp_Poll|Wimp_Poll]] and indicates that no other codes need to be issued. h4. Notes Assuming an application does not need to respond to this reason code, it is highly advisable to [[Poll Mask|mask]] it out. This will greatly improve the responsiveness of the system as Wimp_Poll will never give the application control, for it simply to ignore the reason code. h4. See also * [[Poll Mask|Poll Mask]] * [[Reason Codes|Reason Codes]] * [[Wimp_Poll|Wimp_Poll]] * [[Wimp_PollIdle|Wimp_PollIdle]]