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  Sessions, Desktops and Windows Stations
Time: 08:56 EST/13:56 GMT | News Source: Microsoft | Posted By: Kenneth van Surksum

Today we are going to briefly go over the basics of some concepts that can be pretty confusing even at the best of times - Sessions, Desktops and Windows Stations. So let's dive right in ...

A session consists of all of the processes and other system objects that represent a single user’s logon session. These objects include all windows, desktops and windows stations. A desktop is a session-specific paged pool area and loads in the kernel memory space. This area is where session-private GUI objects are allocated from. A windows station is basically a security boundary to contain desktops and processes. So, a session may contain more than one Windows Station and each windows station can have multiple desktops.

Only one windows station is permitted to interact with the user at the console; this is called Winsta0. Under Winsta0 there are three desktops loaded: Winlogon (the logon screen), Default (the user desktop) and Disconnect. All three of these have separate logical displays, which is why your main desktop disappears if you lock the workstation. When you lock the workstation, the display switches from Default to Winlogon and there is no user interaction between the two. In Windows Vista this is even a bit more extreme. When you get a UAC prompt for instance, it takes a screenshot of your Default desktop and then displays it dimmed out behind the UAC window in the foreground. The UAC window is part of the Secure Desktop (new for Vista and similar to the logon desktop) and will not allow you to interact with the Default desktop until you provide input. (continue at source)

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