+ System options can be set by the program itself using SetOption() method
+ and they also can be set from the program environment by defining an
+ environment variable @c wx_option to set the given option for all wxWidgets
+ applications or @c wx_appname_option to set it just for the application
+ with the given name (as returned by wxApp::GetAppName()). Notice that any
+ characters not allowed in the environment variables names, such as periods
+ and dashes, should be replaced with underscores. E.g. to define a system
+ option "foo-bar" you need to define the environment variable "wx_foo_bar".
+
+ The program may use system options for its own needs but they are mostly
+ used to control the behaviour of wxWidgets library itself.
+