Time for action – creating a data save stack

We're going to make a copy of a stack, but only if another copy of that stack doesn't exist. LiveCode has a nice if there is a… function, which was made for times like this!

First, we will create the stacks we'll need by following these steps:

1. Start a new Mainstack with the name LaunchStack. Save it somewhere other than your computer's Documents folder.
2. Start another new Mainstack with the name AppStack. Save it in the same folder as the first stack.
3. Place some data on each stack's card, so that you can easily recognize when you're in that stack. For example, drag a button onto the card of the LaunchStack stack and name it in a way that makes it very easy to recognize. Do the same for the AppStack stack.
4. Put the following openStack handler in the stack script of LaunchStack:

   on openStack
     set the defaultFolder to specialFolderPath("Documents")
     if there is not a file "AppStack.livecode&quot...