$CharacterEncoding — resettable default character encoding
$SystemCharacterEncoding — operating system character encoding
$Language — resettable default list of languages for information, messages, spelling, etc.
$TimeZone — resettable default time zone
DateString — dates and times with specified formats, in any time zone
$DateStringFormat — resettable default date and time format
$GeoLocation — settable current geodetic location
FindGeoLocation — try to find the current location using GPS, geoIP, etc.
NumberForm — output with specified number formatting
