Can an iPad app directly launch another app?

It depends on the app you wish to launch. Some of them register URLs that let you launch links like itunes:// and the like. Check this out: http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StandardBehaviors/StandardBehaviors.html#//apple_ref/doc/uid/TP40007072-CH4-SW7.

Can you use custom url schemes to launch other apps.

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