FWIW, as one might expect, this has come up before in several threads previously and these are a few of these:

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

http://www.flyertalk.com/forum/showt...ip+housekeeper

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Hope this helps.

Mark