+1
The 90s were wild times. There was a lot of experimenting going on.
In my country, it was all about ISDN and online services like T-Online or CompuServe.
The internet and TCP/IP were very nerdy stuff, I didn't hear about it until 1996 or so.
In the early 90s, in my country, PC networks generally used Novell (IPX), MS Lan Manager or then-new WfW 3.10 (which also was available as part of a network card kit).
Or one of the smaller solutions (Kirschbaum Link/Network).
Novell DOS 7 shipped with Personal Netware and offered Windows 3 support (graphical utilities), too.
The majority of home users was glad to have a humble serial connection, already.
There wasn't much to transfer, anyway.
BBS operators maybe had a dedicated server for storage, though.
And even 115KBit/s of a serial port were fast enough for that, considering that users called the BBS via, say, 19k2 modems.
Two-player mode in games usually supported modem/null-modem.
Commercial titles often offered IPX support, too.
Anyway, there also were power users of the time. Machinery in a factory, workplaces for CAD/CAM, hospitals, warehouses, etc.
These places already had similar infrastructure to what we have now.
Edit: Public utility, schools, universities and military also had "real" PC networks running at the time.
Doom can help finding more information about it, maybe, because it was famous for slowing down network performance.
https://doomwiki.org/wiki/Doom_in_workplaces
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