Oracle 7 and heterogeneous distributed databases

I was reading some Oracle 7 propaganda (well, the notes from a course on oracle 7 somebody here took), and saw a few pages discussing
"heterogeneous database networks" or some such -- it seems Oracle 7
will be able to cooperate with other vendors' databases. Unfortunately, these notes are basically copies of overheads, and so contain very little information. Could anyone suggest where I might find further documentation or information? (Our regular Oracle 7 docs haven't arrived yet, and besides I suspect this is a bit esoteric to be in the usual set.)

Thanks!

PS. Are any Oracle folks out there who work(ed) on this interested in an innovative new use of this facility?

-- 
Frederick G. M. Roeber | CERN -- European Center for Nuclear Research
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