+---------------------------------+
|                &                |
+---------------------------------+
& <memvar> [. <expC>]

-----------------------------------
Macro substitution.
-----------------------------------

Whenever possible, use a name expression instead of macro substitution.
When the & function precedes a character type memory variable, macro
substitution is performed with the memory variable.  Macro substitution
treats the contents of the memory variable as a character string
literal.

<memvar>
        Include the name of the memory variable <memvar> used in the macro
substitution.  The expanded macro should not exceed 255 characters.

 [.<expC>]
        The . (period) delimiter and <expC> can be used to append additional
characters to a macro.