" This memo defines the format for specifying iCalendar object methods.
An iCalendar object method is a set of usage constraints for the
iCalendar object. For example, these methods might define scheduling
messages that request an event be scheduled, reply to an event
request, send a cancellation notice for an event, modify or replace
the definition of an event, provide a counter proposal for an
original event request, delegate an event request to another
individual, request free or busy time, reply to a free or busy time
request, or provide similar scheduling messages for a to-do or
journal entry calendar component. The iCalendar Transport-indendent
Interoperability Protocol (iTIP) defined in [ITIP] is one such
scheduling protocol."

"The NY Times reports that architects Irene Cheng and Brett Snyder “have created a virtual map to guide users around Manhattan to sites where projects they describe as ‘visionary’ were planned but never built. The map is available as an interactive iPhone application…that uses GPS technology to detect when a user is near any of the roughly 50 notable sites, triggering a feature that allows the user to learn about the proposal through the architect’s foiled designs and words. ‘It’s a wall-less museum where the art isn’t even there,’ Mr. Snyder said. ‘The juxtaposition of what could be against what is’.”"