Invantive Script variables are globally named variables with a string value. The names are all case-insensitive.
The value of an Invantive Script can be used in SQL statements or variable value assignment by using the syntax
which expands run-time to the string value of the variable. Expansion is recursive: it repeats itself till there are no Invantive Script variables left to expand.
An error is triggered when an undefined variable name is used.