Update records between apps

I'm having trouble trying to figure out how to update records between apps. My end goal is to have a form that will repopulate with information from a previous unfinished record so that you can finish it. There will be two apps. App1 has the original form and databse attached to it. App2 will have the form that will repopulate and allow customers to finish unfinished records.

How do I update records in app1 from within app2? Also how do I comment out the code in deluge?