To me there are two key ways to do multi wiki search, 

publish them on the internet with static tiddlers as well, which node 
implementations support and get the search engines to index them then use a 
search against your domain.

If your wikis are not public I would build a directory or idex wiki which you 
can access through an iframe. Basic keyword tiddlers in the index may be enough 
for basic searches however if you have different text changing in your wikis I 
think we need to make a tool to extract keywords from a wiki into a tiddler 
that is dropped on the index wiki. When you search on the index wiki you can 
find in which wikis the word combo exists in. Then search in the wiki to 
identify tiddlers possibly from inside another iframe.

This can be made more sophisticated but I expect this approach would cover many 
cases.

Regards
Tony

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