While the Windows 9x
series offered the option of having profiles for multiple users, they had no concept of access privileges
, and did not allow concurrent access; and so were not true multi-user
operating systems. In addition, they implemented only partial memory protection
. They were accordingly widely criticised for lack of security.
The Windows NT
series of operating systems, by contrast, are true multi-user, and implement absolute memory protection. However, a lot of the advantages of being a true multi-user operating system were nullified by the fact that, prior to Windows Vista
, the first user account created during the setup process was an administrator
account, which was also the default for new accounts. Though Windows XP
did have limited accounts, the majority of home users did not change to an account type with fewer rights – partially due to the number of programs which unnecessarily required administrator rights – and so most home users ran as administrator all the time.
cut from wiki