Library /sys$common/syshlp/basichelp.hlb Arrays  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  An array is an ordered arrangement of elements (subscripted variables)  in
  up to 32 dimensions.  You can explicitly declare the data type and size of
  arrays in a DECLARE, COMMON, MAP, or DIM statement.

  Additional Information (explode) :

• Virtual arrays
• Bounds