8D. the array type (ARRAY)
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ARRAYs are declared by specifying their length (in elements):

DEF b[100]:ARRAY

this defines an array of 100 bytes. Internally, 'b' is a variable of
type LONG and a PTR to this memory area.
Default type of an array-element is CHAR, it may be anything by specifying:

DEF x[100]:ARRAY OF LONG
DEF mymenus[10]:ARRAY OF newmenu

where "newmenu" is an example of a structure, called OBJECTs in E.
Array access is very easy with:   <var>[<sexp>]

b[1]:="a"
z:=mymenus[a+1].mutualexclude

Note that the index of an array of size n ranges from 0 to n-1,
and not from 1 to n.
Note that ARRAY OF <type> is compatible with PTR TO <type>, with the
only difference that the variable that is an ARRAY is already
initialised.