Phase IV addresses are used when registering or modifying node
 information.  They can also be used when specifying nodes to show,
 export, or deregister.

 The format for a Phase IV address is either:

   <area>.<nodeid>
   <area>.<nodeid>+<prefix>

 Where:

   <area>   - The area number, from 1 to 63
   <nodeid> - The node id within the area, from 1 to 1023
   <prefix> - The optional Phase IV prefix

 For example:

     1.5
     1.5+39:840:

 When a Phase IV format address is specified, it is combined with the
 Phase IV prefix value to create an NSAP.  This Phase IV prefix value
 consists of the AFI, IDI, and preDSP fields of the NSAP.  If the
 Phase IV prefix is not specified with the Phase IV address, the value
 set in the preferences form is used.

 If a Phase IV address is used when indicating the nodes to show, export,
 or deregister, wildcards (indicated by asterisks) can be used to
 indicate multiple nodes.  Either the node id or the area plus node
 id can be wildcarded.  For example:

     1.*     (all nodes in area 1)
     *.*     (all nodes in all areas)