How to buy exterior locksets w/ same key?
I'm looking for locksets for all our exterior doors (front door, side door, French patio doors). For the life of me, I can't seem to find any resources online that explain how I can purchase locksets where we can use the same key for any exterior door. Can anyone point me to a good resource, or explain here? e.g.
-Do you have to buy them all as a package together, or just the same manufacturer?
-If it's simply just a matter of buying the same manufacturer, how do you even go about getting the 'matching' locks across these different types of doors?