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Consider the following scenario:
You create multiple desktops on a Windows Vista-based computer.
You start Windows Internet Explorer 7 on the default desktop.
You switch to an alternative desktop.
In this scenario, when you try to start Internet Explorer 7 on an alternative desktop, the Internet Explorer 7 browser window does not open. Instead, the Internet Explorer 7 browser window opens on the default desktop.
This issue occurs because protected mode has one separate IEUser.exe broker process. This IEUser.exe broker process makes the following decisions:
Which browser windows to open.
Which third-party programs are hosted in the browser windows.
Whether the browser windows are in protected mode.
Because there is one broker process per user, protected mode allows browser windows to open only on the default desktop.
To work around this issue, start Internet Explorer 7 on the default desktop.