A Prototyping Tool.

• It is good, to ptototype some app with a distinct, simple logic.
  

• It is not suitable, to prototype apps with dynamic layout. Complicated sliding, dragging is a pain to implement.
  
• It is not suitable, to prototype using mass data, like arrays.
  Said I have 10 Objects which I click on. On the next screen the objects which I have ever clicked on - should be disabled.

Simulate nested ifs with dynamic Panels. For each case an own Panel:

\\nested if
if (ticketNotValidated){
 if ticket(networkConnectionPresent){
   // Popup A
 }else{
   // Popup C
 }
}else{
   // Popup D
}