LNMPHASHTBL

   LNMPHASHTBL sets the size of the process logical name hash table.
   Logical names are hashed using a function of the name length
   and contents. The LNMPHASHTBL parameter determines the number
   of entries for process-private logical names. The recommended
   setting is the average number of process-private logical names.
   Note that the hashed values are rounded up to the nearest power
   of 2.

   LNMPHASHTBL has the GEN attribute. On VAX systems, LNMPHASHTBL is
   also an AUTOGEN-altered parameter.