That would depend on how you define multiuser:
yes. windows nt is a multiuser operating system
unix is a multiuser operating system but widows is a single user operating system.
it is a multi user OS
Yes, a multiuser operating system is also described as a network operating system.
Linux.
windows does have the facility to give access to different users. That is the reason we can log on to different user accounts on windows. But windows does not give access to multiple users at the same time in a single processor system.
Read your EULA. The license encourages you, and only you, to use the PC, even if you install sshd or vnc so others can use it. Now ask yourself if Debian Linux is a multiuser operating system.
Novell Netware ? ? ?
multiuser
It is a multitasking, multiuser opearting. It is a version of UNIX .
It is a network or multi-user operating system.
Multiprogramming System: In multiprogramming system the same memory is shared by different number of programmes. MultiUser system: More than one user can use the system at a time.There will one centralized server and the users connected with the system are called as dump terminals.