Hi Time Lady,
Thank you for continuing to look into this for me.
It is the original dongle, there is only one for all 3 devices (keyboard, mouse, number pad).
I think there were various dongle types manufactured over time and so mine doesn't have a button.
The dongle connects to Windows okay and is discoverable in bluetooth.
After another couple of hours working with Microsoft Support, the conclusion is that the buttonless dongle connects automatically to Bluetooth. However, my dongle must be faulty because it doesn't communicate with the keyboard etc. (It must be the dongle
at fault. If a device was faulty, the others would still work).
From forums, it is clear that I cannot replace the dongle. They are specific to that keyboard etc. (for security, to prevent nearby people's keyboards connecting?).
Which means that I need to purchase a whole new ergonomic keyboard and mouse. I will look for a wired set next time!
Thank you again for your help. Your link to Microsoft's Bluetooth Help for keyboards convinced me to contact Microsoft support. (That it wasn't just me doing something wrong). And Microsoft Support have exhausted all possible software solutions. At least
I know that it will never work.
Best regards,
Joan.