Hi Wolfgang, I am late as I was busy elsewhere, but thanks a lot for your help. Am 25.06.21 um 13:44 schrieb Wolfgang Schuster:
\startsetups [userdata:shiftblock] \signalrightpage \doifelserightpage { \startnarrower[2*left,-2*right] \getuserdata \stopnarrower } { \startnarrower[-2*left,2*right] \getuserdata \stopnarrower } \stopsetups
\defineuserdataalternative [shiftblock] [renderingsetup=userdata:shiftblock]
\defineuserdata [shiftblock] [before=\blank, after=\blank, alternative=shiftblock]
\setuppagenumbering [alternative=doublesided]
\starttext
\startbuffer \dorecurse{2}{\input knuth\par} \startuserdata[shiftblock] \input ward \stopuserdata \dorecurse{2}{\input zapf\par} \stopbuffer
\dorecurse{10}{\getbuffer}
\stoptext
I'll try to adapt this into my project. Thanks a lot. juh