Thanks.

You can use \framed but like a minipage no page breaks are possible in a block.

> This sets very well the german and the arabic text, with different interlinespaces. Is there a possibility to copy this into ConText?

You can use natural tables (or xtables) and use the loffset and roffset keys for
margins between both columns. You can also hide the table commands in your
own macros for the texts.

Maybe the minipages/frames are really the only possibility, so that I have to resign page-breaking, sad, but if this is the only way... Because without different line-interspaces the arabic text is definitely not well readable.     

Now I tried it with frames; this is my try (from the wiki):

\starttext
\startcombination[2*1]
{\framed
   [width=4cm,
    align={flushleft}]
   {\input ward }}
{\framed
   [width=4cm,
    align={flushleft,nothyphenated,verytolerant}] % maybe also stretch
   {\tfb \input ward }}
\stopcombination
\stoptext

But it seems to not matter, if I write 2*1 or 1*2, in both cases the frames are set one below the other, and not side by side (what I want). Why?