portmapper

    A server that converts TCP/IP protocol
   port numbers into RPC program numbers.  It must be running
   in order to make RPC calls.

   When an RPC server starts, it tells portmap the port number it
   is listening on and what RPC program numbers it serves.
   Before a client can call a given RPC program number, it must
   contacts portmap on the server machine to determine the port
   number to which RPC packets should be sent.

   (1996-12-09)