Programming Reference Manual
 
Evaluate an expression, assign a variable or call a subroutine.
•   Type "?expr" <Enter> to show the value of "expr".
•   Type "var = expr" <Enter> to change the value of "var".
•   Type "Set var = expr" <Enter> to change the reference of "var".
•   Type "subname args" <Enter> to call a subroutine or built-in instruction.
•   Type "Trace" <Enter> to toggle trace mode. Trace mode prints each statement in the immediate window when a macro/module is running.