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Very many thanks to all for replying so quickly. Your replies are much appreciated.
Nikolas : I'm not too sure what is meant by “network”. I have not deliberately set up a network having only one computer hard wired to the modem. But reading the replies received I get the impression that a “network” can involve other devices that are indirectly connected to the modem via a wireless router. If so, then I do have an indeterminate number of networked devices. In addition to my main hard-wired desktop the other indirectly connected devices can include the observatory laptop, my iPad, a daughter's personal laptop and a variable number of iPhones and iPads used by grandchildren and their friends.
Damien : I would try if I could understand what to do but given my lack of tech expertise that's not likely.
Colin : Your reassurance is comforting.
Gary : I did as you suggested and found that indeed the stated selections were already active in the “Network and Sharing Center”. As to whether all devices are configured correctly to obtain IP addresses dynamically, that I don't know and I don't presently understand how I can check to see.
Paul : I've no doubt that you are right but setting IP addresses is presently a bit beyond me.
In summary, I think that I'll shelter behind Colin's reassurance and hope that my failure to take the active steps suggested by others due to my lack of tech expertise will not result in disaster further down the track.
Again thanks.
David
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