what is code for this?
Do you want to open the third app in your app?
If so , you can try the following methods：
1． with a specific URL schema
You can try to call Device.OpenUri with a specific URL schema, example:
For more details: https://riccardo-moschetti.org/2014/10/03/opening-a-mobile-app-from-a-link-the-xamarin-way-url-schemas/https://blog.xamarin.com/deep-link-content-with-xamarin-forms-url-navigation/https://github.com/xamarin/recipes/tree/master/Recipes/ios/shared_resources/phone/dial-phone-uri
2． With package (android)
Intent intent = new Intent(Intent.ActionMain);
Intent intent = PackageManager.GetLaunchIntentForPackage("com.package.address");
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