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Receipts
Authored by: alblue on Feb 04, '05 11:39:55AM

They're also used in the Software Update mechanism to let you know what's available. When Software Update connects, it essentially interrogates what receipts are on the machine (thus: what is installed) to prompt you what updates there are. So if you don't have iPhoto5 installed, you don't have the receipt for iPhoto5, so it doesn't inform you of any updates.

Note that this doesn't mean you can get iPhoto5 for free by hacking together a receipt; the updates are only deltas from the original install, so you'll still be missing some key files, even if you could download and install the update.



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