Scripting
MoStacks includes a script language: With the help of a programming language that is inspired by HyperCard's HyperTalk language you can add "intelligence" to your stacks and do much more than mere static pages with static values would allow.
Only a small subset if HyperTalk is implemented so far, but the most important things like expressions, loops, and conditions are there, and the implemented subset will hopefully grow over time.