Instanced objects share the same modifier stack.
Instanced objects share the same modifier stack.
This central concept takes a moment to get used to, but it's one of the things that make MAX so powerful. Duplicate objects can be connected to maintain the very same modifier stacks. Thus, they always remain identical as you model, and any change made to one affects the other. Create a box on the ground plane. Move the two boxes apart so that you can see them both.