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A one-pole shelter (e.g. teepee) properly staked down and guyed out is going to be pretty darn secure against wind and snow. Some winter tents come in this configuration.
I don't recall seeing a "twin peak" configuration winter tent. As you might picture, they won't shed snow as well.
But two poles can also make a dome. This is good enough for most 3-season use, but for serious winter or mountaineering, even dome tents will often come in 3 or more pole configurations. Increasing the number of poles and intersection points provide increased structuring / load bearing strength.
Edited by ben2world on 05/01/2008 00:38:16 MDT.
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