There are a number of flaws in the arguments in that message. Currently all old 
apps, proper XCode ones or non-XCode ones, don't behave correctly with the 
multitasking. Some apps don't pause when you're fast app switching, and even 
the ones that do pause do a start from scratch when you return to the app. Only 
the new versions of apps from Apple do the correct resume exactly where you 
left off behavior.

I think that it will come down to suspend and resume events, and that whatever 
tool you're using would need to pass those on, and your app itself should do 
the right thing with those events.

In SJ's presentation one of the third party people mentioned how they 
completely added in the multitasking changes in a day. That tells you that 
there are changes to be made, and the OS is not going suspend and resume every 
app ever written.

It is quite possible that anything that is XCode based might start to behave 
properly if just recompiled under the SDK4, and that would indeed show an 
advantage of having used XCode. But what Apple could do is insist that all apps 
honor the multitasking rules, and not worry about the tool that was used. Then 
people like Adobe and RunRev would just need to fix their tools to make sure 
that built apps do the multitasking correctly.


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