Is there a way to link 2 applications?

Is there a way to link 2 applications?

I was wondering if there could be a way to link 2 applications i.e. App 1, let's call it Contacts, and then App 2, let's call that Hobbies, so in Contacts I would add all of the contacts and their info... so in Hobbies i can access Contacts and find a name then select the name and add a list of hobbies.
I need the apps to be 2 different ones though as the information I am adding is a lot, and not all of the things in app 1 have the information, so it is easier to create 2 different apps so the information can be managed easier.