From Joomla! Documentation
The "API16" namespace is an archived namespace. This page contains information for a Joomla! version which is no longer supported. It exists only as a historical reference, it will not be improved and its content may be incomplete and/or contain broken links.
JVersion is a class that provides Version information about the currently installed Joomla application.
|getLongVersion||Method to get the long version information.|
|getShortVersion||Method to get the short version information.|
|getHelpVersion||Method to get the help file version.|
|isCompatible||Compares two "A PHP standardized" version number against the current Joomla! version.|
|getUserAgent||Returns the user agent.|
jimport( 'joomla.version' );