7A. const (CONST)
-----------------
syntax:		CONST <declarations>,...

Enables you to declare a constant. A declaration looks like:
<ident>=<value>
constants must be uppercase, and will in the rest of the program be
treated as <value>. Example:

CONST MAX_LINES=100, ER_NOMEM=1, ER_NOFILE=2

You cannot declare constants in terms of others that are being
declared in the same CONST statement: put these in the next.

CONST, ENUM and SET declarations are always global, i.e. it is not
possible to declare constants local to a PROC. The best place for
constant declarations is at the top of your source, but EC also
allows you to put them between two PROCs, for example.