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Microsoft ending support for Windows 10 could send 240 million PCs to landfills: Report - CNA
(www.channelnewsasia.com)
This is a most excellent place for technology news and articles.
I'd imagine it would have been some gprs-modem through an adapter for sms notifications, that was added afterwards in the 90's
There is a device for connect it to internet, via an ethernet cable and with some software, for bbs by example.
Getting a C64 to host an remote interface page would definitely be "beyond the call of duty".