It adds support for Fast User Switching and Terminal Services.

In Windows XP, Offline Files could not be enabled when Fast User Switching was enabled.

This restriction applied because Offline Files were synchronized at log off and Fast User Switching does not completely log off users.

There may also be multiple users logged onto the computer at one time using Fast User Switching.

With Fast User Switching, you can easily switch from one user to another on the same computer.

Of all the new features in Panther, Fast User Switching has made the biggest difference in my computing life at home.

Fast User Switching is Apple's name for the feature that allows more than one graphical login on a single Mac simultaneously.

Microsoft says that the reason for this discontinuation of feature is to support Media Center Extenders which need Fast User Switching.

Finally, Panther offers Fast User Switching, modeled on the identical feature in Windows XP.

Let's hear it for Fast User Switching!