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According to Jim Gray, the UNDO mechanism of InterLisp (from Xerox) inspired the transaction system of System-R (one of the first relational databases).

http://books.google.com/books?id=S_yHERPRZScC&pg=PA575&#...

I think he's talking about InterLisp-D in that section. Anyone know if earlier versions had the same kind of UNDO?

"The library did have Founders at Work--because it wasn't checked out. :-)"

Oh, burn. Jessica, are you just going to take that?

Why check it out if you already own it?

or it might have been the reference copy that couldn't be checked out :)

Oh, the glory days when people still did the R in R&D.

A Tour of Xerox PARC