Handling Older Versions of OS X Gracefully

One of the advantages of being a newcomer to Cocoa is that I can make my life easier (albeit at the expense of a few potential users) and concentrate on Leopard-only code and ignore all of those previous version of OS X that have gone before. A result of this, however, is needing to tell a user who has downloaded your application that they need a more recent version of OS X or even simply that they need to update from, say, version 10.5.2 to 10.5.4.

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