Dascom TallyCom III FSL Reference Manual - Manual (Page 44)

Appendix J Abbreviations
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Abbreviation Full name Explanation
VM Virtual Machine IBM operating system for
mainframes. OS/390 (MVS)
and other operating systems
can run under control of VM.
WAN Wide Area Network Usually Coax and Twinax
networks. Today it is also
used for larger TokenRing
and Ethernet networks
and/or Router base
networks.