\starttext

    \enabletrackers[buffers.run]

    \startbuffer [sample]
        \starttext
            \startTEXpage[offset=10pt] one   \stopTEXpage
            \startTEXpage[offset=10pt] two   \stopTEXpage
            \startTEXpage[offset=10pt] three \stopTEXpage
        \stoptext
    \stopbuffer

    \typesetbuffer[sample][frame=on,page=1]
    \typesetbuffer[sample][frame=on,page=2]
    \typesetbuffer[sample][frame=on,page=3]

    \externalfigure[\lasttypesetbuffer][frame=on,page=2]

    \typesetbuffer[*][frame=on,page=3]

\stoptext
