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  Name:     seg() - get the segment address of a string variable
  Usage:    <integer> = seg(<variable>)
  Params:   string <variable> - a parameter of type string
  Returns:  an integer equal to the segment address of the
            passed string in decimal

 ---------------------------------- Example ---------------------------------

            * Use DOS interrupt to print a string, DOS function
            * 9 prints a string that is terminated by a
            * dollar ($) sign.....

                 * here's the string to print
                 string = "This is the string to print...$"

                 * register DS needs the segment of string
                 reg_ds(seg(string))

                 * register DX needs the offset
                 reg_dx(off(string))

                 * register AH needs the DOS function #
                 reg_ah(9)

                 * execute the DOS interrupt (21h) to print the
                 * string to standard output
                 interrupt(33) && (decimal 33 == 21h)