With the popularity of LCD Wide screen displays sometimes the wasted space to
the sides is too much, so, it could be convenient to start designing
applications that fix this space, the horizontal split for documents in word
is good, but based on the diplay it is also good to have the posibility to
split the display vertically to see 2 different pages of the document at a
time.

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http://www.microsoft.com/office/comm...ord.pagelayout