This function creates a DCL command file, with two secondary NCL command
 files, that may be used to create or delete interphase link entries
 in the reachable address table of a DECnet-Plus Level 2 Router that must
 route messages between a DECnet-Plus level 2 network and a DECnet Phase IV
 level 2 network.

   CREATE IPL_INITIALIZATION_FILE command-file-name FOR router-node-name

 Executing the resulting command file allows the target router to send
 routing information to Level 2 routers using either the DECnet-Plus or
 DECnet Phase IV routing protocols (link state and routing vector,
 respectively) at level 2.

 The target router's reachable address table will have "outbound" entries
 created for all areas that are reachable through the adjacent routers that
 are running the DECnet Phase IV routing vector protocols at level 2.   The
 target router's reachable address table will also have "inbound" entries
 created for all areas that are currently reachable through the DECnet-Plus
 link state level 2 network.

 Every DECnet-Plus Level 2 Router that has interphase links should have its
 reachable address table updated whenever the Level 2 network configuration
 changes.