[Arguments] variableName, newValue, scopeName(optional) [Return Value] Success or Failure [Sequencing Description] Assigns a new value to the variable specified. If scopeName is not specified, the variable is accessed in the topmost scope on the stack. A Failure status is returned if the specified variable or scope cannot be found. [Function] 
UpdateVariable
C r e a t e S c o p e
D e l e t e S c o p e
C r e a t e V a r i a b l e
D e l e t e V a r i a b l e
U p d a t e V a r i a b l e
R e a d V a r i a b l e
E v a l u a t e E x p r e s s i o n