The functions in eta/Post are prioritized. Functions in Display Options
can be accessed to at any time. The functions in Edit and Tool menus have the
highest priority. If any of these functions is started, all other functions in
eta/POST are disabled.
Control Window has the lowest priority. The user is able to access other
functions when Control Window is opened. Only functions in Edit menu, Tool menu,
and Display Option are allowed to be used during animation.