How does OSX "mark" applications as OK?

When downloading an app over the Internet, OSX will ask if it is OK to launch the first time; then, doesn't ask again.
I just bought a MacBook Pro for my wife and set it up with two accounts with me as Admin and her with admin privileges.
I downloaded Thunderbird using my account but didn't launch it since I didn't want to pull my email onto that computer. I loaded the profile from my wife's iBook to her account library.
When my wife launched TB all was good except, the pop up about the TB app being downloaded from the Internet popped up every time she launched TB. I concluded that since only I had write privileges for TB that OSX couldn't mark it as OK. I changed the privileges so any one with admin status could write. Launched it in her account with the pop-up the first time; then, relaunched it and no pop-up. Set the privileges back and no pop-up.
I have concluded that OSX must write some type of marker to the app so it doesn't keep asking.
Anyone know what it writes and where it is stored?
Message was edited by: RobertVJ

Malcolm,
That second link was quite interesting. I understand about the meta-data thing but I need to do another more thought out experiment when I have some time.
NOTE: I didn't look at the contents directory using the Finder; I looked at it using BBEdit which can examine invisible files and got the creation time-stamp of the file using FileXaminer.
I Still go back to the app on the mounted dmg. I launched it and got the pop-up. Quit it with the dmg still mounted. Relaunched it and got the pop-up; so, even though I never dismounted the dmg the pop-ups keep coming. Now, if OSX tries to store the meta-data on the relevant disk (in this case a mounted dmg), which would make sense, your meta-data explanation sounds correct.
Thanks. I have found that many heavy users of this forum seem to be striving for volume rather than quality. Specifically, they don't thoughtfully read a question and just pop out the first thing that comes to their mind. Malcolm, I don't put you in this group.
I'm a Mod on Mozillazine and have seen a few there too.
Cheers!

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On 6/3/2010 8:16 PM, ntbutler wrote:
>
> Does anyone know how ZENworks checks associations to packages. We have
> hundreds of applications on the school system, and a large number of
> them are unused, but we still have them in the system in case they are
> needed again in the future (like training applications for example).
>
> It takes quite a while for our users to log in and get all of the NAL
> shortcuts, and my thoughts are that ZEN checks all applications to see
> if they are associated to the user or workstation, but I wanted to know
> to see if it is worth culling all of these unused apps, or if our speed
> problems would be arising from some other issue.
>
> Thanks,
> Nathan
>
>
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