URGENT - iPhone SDK - Is there a way to figure out if an App is installed?

If i have an *app id* in hand to one of my applications, is there an API which i can use from another app to see if my primary app is installed on the device or not?
i.e from *App B* can i figure out if *App A* is installed?
Thanks in advance,
TRS

That was a great suggestion. Would have been good if it worked.
The call always returns NO for custom URL. Works fine for regular http urls.
If only openURL method of UIApplication did the right thing by returning NO if a custom handler could not be found, instead of showing a stupid alert and returning YES . Who does such stupid coding at Apple?
Sorry for venting out my frustration.
Thanks a lot for your suggestion which i felt was a really good one.
-TRS

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