[Arguments] expr, scopeName(optional) [Return Value] value [Sequencing Description] Evaluates the specified expression and returns its value. If scopeName is not specified, the expression is evaluated in the topmost scope on the stack. An error is raised if the specified scope cannot be found. [Function] 
EvaluateExpression
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