Original poster: "tp zon2 by way of Terry Fritz <teslalist-at-qwest-dot-net>" <ajbmpeters-at-zonnet.nl> Ok guys, Thanks for all pro- and con anwers. I have read it all, including the docs at some pacemaker manufacturers sites. For the moment I think it is not wise to fire up my coils. Keep coiling and posting in this group, I still read all the mail.......... greetings Ton NL