I suppose you could just import SQL data, which would have to be made from data from either a bookmarks file or an xml file.
The table to import into is fo_objects, from what I can tell. And you would need to know what the object_type_id field is also (it's "4" in my installation, but I don't know if that's consistent across other installs.)
This is for FengOffice 2.0 Beta3, BTW.
R.
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