iOS How to launch 'custom app' from xcode

[dustin.weeks]

Hello,

I am writing two programs <program-1> and <program-2>

now from <program-1> when user clicks a button i want to launch <program-2> how can i do it?

also if [UIapplication sharedApplication] openURL
also how to launch 'contacts book' using openURL?

Thanks,
Dustin.

 

[jnic]

Custom URL schemes.

also how to launch 'contacts book' using openURL?

Not supported.