Roofing Ice and water shield

Is ice and water shield used in the Northeast U.S for asphalt shingle roofs beypnd the eaves and valleys? Would there be any benefit to using it around flashing for chimmney, vent pipes, air vents? Is it needed along the rakes and ridge of the roof also?
Many thanks !!
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Watch this video on installation and they'll tell you all the places to use it.
http://www.gaf.com/General/GafMain.asp?Silo=CONT&WS=GAF&App=ROOF&Force=../../../../General/SearchSite.asp%3fSearchStr=ice%20&%20water%20shield%26Silo=CONT%26App=ROOF%26WS=GAF
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Oops, the link wasn't complete. When you get there, click on 'installation videos", then click on "install WeatherWatch or StormGuard".
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wrote:

Oops, the link wasn't complete. When you get there, click on 'installation videos", then click on "install WeatherWatch or StormGuard".
What an exceptionally informative set of videos!!! I really learned a lot and enjoyed watching these. Thanks for providing the link!!
Smarty
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