By Richard Mallion

iCal on Mac OS X has a hidden debug menu which you can enable from the terminal by using the defaults command. Once enabled you gain 24 additional options. A lot of these features are useful for developers but quite a few are possibly useful for the end user.
To Enable:
- Quit out of iCal and then launch the Terminal
- Enter the following command:
defaults write com.apple.iCal IncludeDebugMenu 1
- Open iCal again to find the “Debug” menu
Some of the extra features include:
- Open multiple iCal Calendar windows with Command+L – making it easier to compare dates and schedules on any level
- Change the number of weeks that appear before and after the start date in Day View
- Show more than 7 days in a week (7, 14, 21, and 28 days)