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Windows file sharing (and by extension Samba) came from Apollo. It's little known:

https://www.oocities.org/zuhair_ali/linux/samba.html

A nit to pick - MSRPC came from Apollo RPC, but SMB came from IBM: http://ubiqx.org/cifs/SMB.html

Another little tidbit which is not much known:

Furthermore, I didn't find out that Samba inter-operated at all with any version of DOS or Windows until nearly two years after I did that first release. The earliest versions of Samba were aimed at being compatible with clients for the Digital Equipment Corporation "Pathworks" product suite, which was an early implementation of the SMB protocol that was quite popular at the time, and that ran on Ultrix and VMS systems. My initial motivation was to implement the same protocol on SunOS, so that I could use my desktop system to access the departmental Unix server. -- Andrew Tridgell

(Weird - my hospital also has those IBM Type-1 token ring jacks.)

That's right. The RPC transport names in Windows are still prefixed with "nca", a reference to the Network Computing Architecture from Apollo.

https://docs.microsoft.com/en-us/windows/win32/rpc/choosing-...

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