On Sat, 29 Sep 2012, Peter Rolf wrote:

> Am 29.09.2012 16:24, schrieb Philipp Gesang:
>> ···<date: 2012-09-29, Saturday>···<from: Peter Rolf>···
>>
>>> Hi,
>>>
>>> just wondering. Is there a official way to signal ConTeXt from a module,
>>> that an extra run is needed?
>>
>> Hi Peter, some time ago I got this answer from Hans:
>> http://www.mail-archive.com/ntg-context@ntg.nl/msg45820.html
>> (Today the table is “job.variables.tobesaved”.)
>>
> Hi Philipp,
>
> that should work. I was planing to save the graphic hash data (id-> file
> name) as lua file anyway and make use of that data in the following runs
> (compare new and old hash). Storing a checksum of that file should be
> all I need then.


Depending on what you want to do, you may be able to delegate all the book 
keeping to the filter module.

Aditya