This variable contains the comma-separated list of environment variables that will be hidden, i.e. author will not be able to use $wbe function with those variables. Default value is *, what means that all environment variables will be hidden. However, some of the environment variables are very important for developing advanced WBSP-powered sites, so it is good idea to hide only those environment variables that can be abused (e.g. PATH, COMP*, SYSTEM*, etc.)