Windows 7 / Security and Privacy

Secure Desktop

The secure desktop actually makes a bitmap copy of the current screen and then alpha-blends it to darken it. To prove that it's a bitmap copy, open Task Manager, click the Performance tab, and notice how the CPU Usage History chart updates. Then, attempt to open Computer Manager. When the UAC prompt appears, Task Manager stops updating. Task Manager continues to draw the graph in the background, even though it's not visible-this will be apparent if you wait a few seconds and then close the UAC prompt.

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