Thanks for the clarification, Robin. It sounds like a fairly complicated system, but it probably becomes more tidy once you've dealt with it a bit. I've found a web site (here) that goes into it in detail. I'm going to give it a bit of study and try to get an idea of how well it might work here. In theory, of course. The chances are we're stuck with the system we've got, for the time being at least.

Don Firth

P. S.: To Marty:   I saw something about Beavis and Butthead in the TV Guide some years ago. I watched one episode, enough to get the gist of the thing. Toilet humor wears thin after about ten seconds. But obviously you like it quite a bit, since it's your stock in trade,. One suggestion, though:   less toilet and more humor.

Nah, forget it. That would put too much of a strain on you.