Thank you for your concern about the non-robustness of the solution I have adopted. In one of my numerous postings somewhere, I did say that I want the ability to use a batchfile to SAVE as well as close and backup, an open spreadsheet - specifically the one that I open to edit EVERY DAY to record the readings related to monitoring my asthma - and because it is EVERY DAY, I considered it worthwile to reduce the repetitive tasks involved (even if it is only the one extra step of saving). The code you presented, overwhelmed innocent-of-VBS-me. I recognise now that it is like the code I eventually used. If you look back (as you seem to do a lot) you'll read that the light went on for me only when it was stated categorically that what I wanted to do in a batchfile was indeed possible. It may well be that I became more receptive after that - in any case, I was distracted by other issues - accusations of infractions which in hindsight I don't deny, but at the time were like thunder from a blue sky. While I have received very valuable help from the fora, and deeply appreciate it, it is also true the fora are quite complex in the way they have to be negotiated - I might say a minefield for unsuspecting intruders.
You kindly gave me a reference about VBS, which I did lookup, but found daunting as a newbie to VBS, rather than helpful in guiding me to my own solution.
I am quite happy with the performance of the batchfile I now have, and do not expect to use it in any other context - specifically, I will not expect it to handle multiple instances of excel.
Once again, I thank you for the interest you have shown in my question and the effort you keep putting into dealing with my issues.