Library /sys$common/syshlp/ncphelp.hlb SET, EXECUTOR, MAXIMUM AREA number  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Applies only to an executor node whose type is AREA.  Specifies the
 largest area number and, therefore, the greatest number of areas that
 can be known about by the executor node's Routing layer. You can
 specify a decimal value in the range 1 to 63.  The default is 63.