[Function] ReadVariable [Arguments] variableName, scopeName(optional) [Sequencing Description] Returns the value of the variable specified. If scopeName is not specified, the variable is accessed in the topmost scope on the stack. An error is raised if the specified variable or scope cannot be found. [Return Value] 
value
S u c c e s s o r F a i l u r e
S u c c e s s o r E r r o r
v a l u e