Stack control buttons 

There are two control buttons available in the toolbar for moving up and down the stack:

  Moves up the stack level from the current scope location, permitting access to all local variables at that level. A stack level is determined by each calling function.

 Moves down one stack level from the current scope location, permitting access to all local variables at that level. (You must use the Up Button first, since the program counter is as far down the stack as possible.).