multiplayer level editing

In celebrating the tenth anniversary of the Apple-NeXT merger, John Romero has posted an interesting article about the usage of NeXT during ye olde days at id Software. Set in relation to three spaces, the following is especially intriguing:
 

In fact, with the superpower of NeXTSTEP, one of the earliest incarnations of DoomEd had Carmack in his office, me in my office, DoomEd running on both our computers and both of us editing one map together at the same time. I could see John moving entities around on my screen as I drew new walls. Shared memory spaces and distributed objects. Pure magic.
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