Link people database in Auction Trak to Donor Trak

In updating addresses from a stack of 'undeliverable' invitations from our Auction Dinner, I thought of an enhancement for users of both AuctionTrak and DonorTrak.  A handful of our returned invites had updated addresses in DonorTrak that weren't entered in AuctionTrak.  It would be very helpful (and save money) for customers who use both products to have these 2 programs 'linkable' so an address updated in one database would be automatically updated in both.  If that's not possible, how about an easy way to check (maybe a button or something that provides a quicklink) and see if the person exists in the other database?  

Thanks for considering!