Typically contains About AppName, Preferences, Services, Hide AppName, Hide Others, Show All, and Quit
Most of this is handled for you by the OS. You do not have to set this menu up yourself.
SWT does not provide Preferences or About hooks though, and there's no Quit Handler :-(
You can plug-in your own code
SWT doesn't make this easy though: http://azureus.aelitis.com/wiki/index.php/PreferencesAndAbout
Apple has hooks for this, but only in Swing and AWT