Would like to access Splunk indexes with Retrospective

[markus]

I would like to access log files that are stored in Splunk databases, and show this data together with other log files on remote servers.
Frequently, I am dealing with log files that will not be indexed by Splunk, because of their ad-hoc nature.
To investigate problems, it would be great to have a view like in Retrospective, merging the different sources with timestamp alignment.