Visara Master Console Center Scripting Guide - Manual (Page 41)

Chapter 3 Script Syntax
Scripting Guide 41
Expressions
There are two types of expressions, String and Numeric.
String Expressions
String expressions are one or more character strings used in a line of code
in a script.
For example, in the following line, "$Old1 + $Old2" is a string expression
of concatenating two strings together.
$NewString := $Old1 + $Old2
Numeric Expressions
Numeric expressions are plain mathematical expressions that calculate
another numeric value for use in a script. Numeric expressions can only
be performed on integers. For more information on numeric expressions,
refer to Variables on page 36.