After you have two or more accounts set up on one Mac, install OSXvnc and start the server. Once started, Fast User Switch to the other user on the machine. Now from another computer, use a VNC viewer like Chicken of the VNC and point it to the Mac. Simultaneous multithreading (SMT) or as Intel calls it 'Hyperthreading' has been introduced back in 2002 with Intel's Xeon and Pentium 4 processors. Many of today's Intel-based systems on both Windows and Mac OS X utilize Hyperthreading to increase performance by a more efficient usage of CPU resources. In the distributed and cloud computing context of an OS, templating refers to creating a single virtual machine image as a guest operating system, then saving it as a tool for multiple running virtual machines. The technique is used both in virtualization and cloud computing management, and is common in large server warehouses.

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Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

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Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

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If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.