pyVista, version 1.0 beta, is a Python version of the MDO version of the
Delphi RPC Broker. It offers basic RPC connectivity to a single VistA
system. Unlike MDO, it has no multi-site functionality, nor can it
visit Vista systems. There must be a logged in user. It can connect,
login, set context, make RPCs and disconnect. It should theoretically
be able to make any RPC. See tests for how it works.

To begin to delve into the mysteries of VistaSelect see the
documentation at http://vistacowboy.com. Pick "School House/
Rpcs/DDR LISTER".