<texcode>
\setuppagenumbering[alternative=doublesided, state=stop]
</texcode>
'''''Note: this section is inaccurate.''''' Try this minimal example to get started:
<texcode>
\definelayout[odd]
[backspace=1in,
cutspace=1.25in,
width=middle,
height=9in]
\definelayout[even]
[backspace=1in,
cutspace=1.25in,
width=middle,
height=8in]
\starttext
\showframe
\dorecurse{12}{\input dawkins \par}
\stoptext
</texcode>