when I get one that won't close without opening more I use control-alt-delete and end the internet explorer task.

I also like using spyBot to clean my machine from web-loaded spyware and cookies.

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02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)