Use the Connection [local] list to specify the identification string of
  the debug server with which you want to establish a session.  Type or
  select the identification string in the New Connection box.  The New
  Connection list contains the last 10 connections that you have made and
  provides a convenient way to reconnect to a server from which you
  previously disconnected and left running.  Note that the presence of a
  connection path in the list does not guarantee that the server is still
  available

  The most simple connection string contains the name of the OpenVMS node
  followed by the port number within square brackets.  For example:
    NODNAM[4111]
  Other examples of valid connection strings:

    ncacn_ip_tcp:16.32.16.138[4111]
    16.32.16.138
    nodnam.bld.dec.com
    nodnam.bld.dec.com[4112]
    ncacn_dnet_nsp:19.10[RPC2BE08EF00001]