These variables are local to each equate. Variable names are unique to each equate. Their value can be passed to another equate only by giving them as arguments (this is call-by-value, there is no call-by-reference facility). Their value (and declaration) is lost on exiting from the equate. The characters A--Z and a--z can be used to start the name of a local variable and the rest of the variable name can include these same characters as well as the digits 0--9 and the underscore _ character.
Care must be taken when using local variables within a text body (where they are part of the arguments passed to an equate) as these are created as global variables (but not neccessarily with the leading underscore character).
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