Constants
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            A  Constant is one of the two  forms that data may take
            within a  template. It  is literal  data (a sequence of
            literal characters that is used within an expression to
            represent some value) that  does not  change during the
            execution of a template. Constants can be combined with
            other  constants  or  variables  of  the  same type  by
            operators  in expressions to  produce  new data values.
            These new values  can be either  used   directly within
            the template or assigned to a variable.   Constants can
            not be  used on the left-hand side  of an assignment.

            The Template Language  allows the use of  four types of
            constants:

                   Integer constants
                   Logical constants
                   String constants
                   Code Blocks

            An  integer  constant is  a  sequence of  one  or  more
            undelimited numeric characters.

            A logical constant is denoted by either the .T. for the
            value TRUE  or .F. for the value FALSE.

            A string constant is a sequence of typeable  characters
            enclosed  within matching  double or  single quotes.

            A  code block  constant can  be any  Template  Language
            statement with the exception of variable  declarations,
            variable   assignments,  control structures  or  return
            statements.