Interfacing to Mac iCal and Address Book

[Peter Haworth]

Anyone got any tips on how to integrate calendar and name/address info  
from OSX into an application?  Not thinking in terms of import/export/ 
sync, more along the lines of instant query/update/delete.  Not much  
detail there but something along the lines of listing Mac address book  
entries within my app and being able to directly update/delete them  
from within the app.  With the calendar data, use iCal to display  
appointments/tasks but have lists of them in my app linked to their  
iCal entriess so any changes within my app get reflected in iCal.
Thanks,

Pete Haworth