Allan-
If you use the Merge Wizard to concatenate the files into one .IOK, then use Named Queries and Fields settings to direct each tab's views to the correct rows & columns, you can have more than one set of unrelated data (no shared columns) in the same .IOK file and print to a single document.

This point is also covered here:

http://forums.visokio.com/comments.php?DiscussionID=97&page=1#Item_1

Thanks Tom

This approach also works well for loosely-connected data sets e.g. parent-child type data (summary and detail), where some - but not all - keys are related.