For more on [http://context.aanhet.net/svn/contextman/context-reference/en/co-pagedesign.pdf layout and page design] see the [http://context.aanhet.net/svn/contextman/context-reference/en/co-pagedesign.pdf manual chapter].
At the moment a layoutchange (setuplayout) inside a page is not proper working in mkiv duplex mode.
For more details and actual state see mailing list and [http://wiki.contextgarden.net/User_talk:Zenlima Bug Layoutchange inside page while duplexmode].
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== Typesetting areas ==
The 25 typesetting areas of a ConTeXt page are divided into 5 columns and 5 rows. From left to right, one encounters {{code|leftedge}}, {{code|leftmargin}}, {{code|text}}, {{code|rightmargin}}, and {{code|rightedge}}. From top to bottom, the areas are called: {{code|top}}, {{code|header}}, {{code|text}}, {{code|footer}}, {{code|bottom}}. E.g. {{cmdcode|leftmargin}} is the margin area to the left of the main text area; {{code|{leftmargin,bottom}|}} is below it, at the same height as the {{code|bottom}} area. In between the two lies the area {{code|{leftmargin,footer}|}}.
The graphic below illustrates thingsthe areas and dimensions. The row and column names are written
along the edges of the page. The arrows correspond to layout dimensions; the
more important a dimension is (i.e. the more of the layout is pushed around
when you change it), the thicker its arrow and the larger its name.
[[Image:layout.pngsvg||||Diagram of \setuplayout[] dimensions]]