OP Systems of that era...

Windows NT

Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was a high-level-language-based, processor-independent, multiprocessing, multi-user operating system. "NT" was expanded to "New Technology" for marketing purposes but no longer carries any specific meaning.

More OS's from that era

Terms you should know...

Virtual memory - In computing, virtual memory is a memory management technique that is implemented using both hardware and software. It maps memory addresses used by a program, called virtual addresses, into physical addresses in computer memory.
Network connectivity - In mathematics and computer science, connectivity is one of the basic concepts of graph theory: it asks for the minimum number of elements (nodes or edges) which need to be removed to disconnect the remaining nodes from each other.