[Arguments] variableName, scopeName(optional) [Return Value] Success or Failure [Sequencing Description] Deletes the variable with the specified name from the specified scope. If no scopeName is provided, the variable is deleted from the topmost scope on the stack. The status Failure is returned if no variable with the specified name exists in the scope. [Function] 
DeleteVariable
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